Compressor clutch not engaging? (Question)

One of the reasons why compressors do not engage is because of a low pressure lockout, a poor ground, a bad clutch coil, an opening in the wire to the clutch coil, or simply a blown fuse. There are several ways A/C compressor clutches receive power. With engine running, you will want to set the A/C to MAX.

  • There are three reasons why the compressor clutch does not engage, especially if the sensor detects them. These include low or excess refrigerant and insufficient oil. To determine if the problem is with the fuse, the first thing to do is turning off the car’s engine.

What should I do if AC compressor clutch is not engaging?

Check the wiring to the clutch – If wires aren’t connected properly this could impact how the compressor is working. Wire need to be connected and in good condition to provide enough power. (In addition the high pressure switch and evaporator temperature sensor could be faulty or have loose wires)

How do I get my AC compressor clutch to engage?

Take the fused jumper wire and connect its one end to that side of the wire connector that was connected to the compressor. Attach the other end of the jumper wire to the positive terminal of the battery. It will supply the battery voltage to the compressor clutch, allowing it to engage manually.

How do I know if my compressor clutch is bad?

Bad AC Compressor Clutch Symptoms

  1. Higher Cabin Temperatures. The most common sign of all bad ac compressor clutch symptoms is a higher cabin temperature than usually during hot days when you need the A/C.
  2. Loud Noises.
  3. Clutch Stopped Moving.
  4. Inability to Turn Air On or Off.
  5. Leaking Refrigerant.

What causes compressor clutch failure?

Clutch failure is usually caused by high pressure or voltage issues, or a combination of both. With a wrong charge the pressure switches will cause the compressor to constantly engage and disengage. If there is not enough charge the compressor will overheat due to a lack of oil circulating.

What causes low pressure lockout?

When a unit cycles or locks out on the low pressure switch, what should you look for? the most common cause is low air flowacross the evaporator. look for dirty filters, dirty evaporator coil, dirty blower wheel.

How do I know if my AC clutch relay is bad?

One of the most obvious signs that the AC relay may have a problem is that the compressor is not coming on at all. In most cases, when the AC is turned on you will be able to hear the compressor switch on. It will usually produce a familiar clicking noise from the clutch being activated.

How much does it cost to fix AC clutch?

Between $610 and $664 is the average cost for an AC compressor clutch replacement. Labor costs are between $184 and $232 while parts are between $426 and $432.

What causes a compressor to lock up?

Some of the causes for car air conditioning compressor locking up include incorrect or low quality refrigerant being used, low coolant levels, and improper lubrication. You need to get your car checked out before any issue worsens.

Can you replace just the clutch on an AC compressor?

Yes you can just replace the clutch pulley on the a/c compressor. The issue that you may have is the pulley bearing seized up and may have spun on the front of the compressor nose cone and will damage it.

Can you still drive a car if the AC compressor is bad?

You will be fine as long as you don’t need or want AC in your car. Your AC pulley is a free spinning pulley that has a clutch on it. It will spin freely until you turn the air conditioning on. If the clutch doesn’t work properly, you will still be able to drive your car.

8 Reasons an A/C Compressor Clutch Won’t Engage (and How to Jump It)

The most recent update was made on June 28, 2021. Few car amenities are as well-liked by the ordinary motorist as air conditioning, especially during the sweltering summer months. The air conditioning system in a car effectively stops the summer heat in its tracks, replacing it with a soothing coolness. Are you looking for a reliable online repair manual? The top five choices may be found by clicking here. Nowadays, sophisticated A/C systems are also equipped with dual-climate control, which allows each individual passenger in a car to individually regulate the temperature in the cabin.

Unfortunately, air conditioning-related problems of varied severity can and do arise from time to time.

One of the most prevalent types of A/C system-related defects is that of an inoperable A/C compressor clutch, which is one of the most common symptoms.

Find out more about the reasons of an inoperable A/C compressor clutch and how to resolve the problem if it occurs again in the future by continuing reading this article.

Also see: 8 Reasons Why Your Air Conditioner Isn’t Blowing Cold Air

What is an A/C Compressor Clutch?

It is the air conditioner compressor clutch in a vehicle that is responsible for distributing power to the internal drive components of an A/C compressor’s internal drive system. An air conditioning compressor pulley free spools when the air conditioner is switched off in a car. As a result, no rotational force is delivered to the driveshaft of the air conditioning compressor. This reduces the amount of additional stress exerted on a vehicle’s engine and reduces the amount of internal compressor wear experienced.

This energization of the clutch coil generates a magnetic field, which aids in clutch engagement by drawing the clutch’s drive plate inward, where it meshes with the clutch body/compressor pulley, therefore increasing clutch engagement.

When the air conditioning system in a car is switched off, the clutch coil that is associated with it is de-energized.

Car A/C Condenser Symptoms: What You Should Look For

Causes of an A/C Compressor Clutch That Won’t Engage

For a variety of reasons, including electrical issues, an air conditioning compressor clutch may fail to engage when it should.

The actual reason of such problems varies from one car type to the next, as well as from one year to the next. The following are some of the most prevalent reasons of an inoperable fan A/C compressor clutch, as identified by the manufacturer.

1 – Blown A/C Clutch Fuse

Many times, an A/C compressor clutch fuse is to fault for a clutch failing to engage or turn on when it should have done so. However, it is necessary to discover the exact cause of the fuse’s failure as well. This can be caused by a shorted hot wire or a malfunctioning clutch assembly, among other things.

2 – A/C Clutch Relay Failure

The majority of automobiles rely on the usage of a relay to regulate the operation of the air conditioning clutch. When the relay fails or becomes stuck, it might prevent power from being transmitted to the clutch’s coil.

3 – Faulty Switches

Modern car air conditioning systems rely on the employment of a number of switches in order to function efficiently. These switches have a direct impact on the transmission of power and ground to an A/C clutch. Low pressure switches, high pressure switches, and evaporator temperature sensors are some of the more notable of these switches. The breakdown of any of these sensors can result in the inability to operate an A/C clutch.

4 – Faulty Wiring

In most situations, electricity and ground are supplied to an A/C compressor’s clutch assembly by a wiring pigtail that is connected to the engine’s main wiring harness through a connector. It is not possible for the compressor’s clutch to work if there is an open state on any of the wires in this circuit. In rare circumstances, the wire may be in good condition, but the harness may be faulty.

5 – Low Refrigerant Charge

In most situations, electricity and ground are supplied to an A/C compressor’s clutch assembly by a wiring pigtail that is connected to the engine’s primary wiring harness. It is not possible for the compressor’s clutch to work if any wires in this circuit are in an open condition. The wire may be in good condition in certain instances, but the harness may be defective.

6 – High Refrigerant Charge

In a similar vein, the high pressure switch on an air conditioning system is designed to limit power and ground delivery to a compressor’s clutch in the case of an over-pressurization occurrence. If a system is overloaded with refrigerant, the high pressure switch will, by default, impair the clutch’s ability to operate.

7 – Faulty A/C Clutch

The clutch component of a compressor might begin to exhibit signs of wear and tear over time. The face of the clutch plate of an A/C clutch will wear down over time, and this will cause the clutch to slip. It is also possible for the coil of an A/C clutch assembly to break completely, preventing the clutch from engaging.

8 – Control Head/Computer Failure

Through the system’s dash-mounted control head, an A/C clutch receives its operating orders from the driver and performs the necessary operations. Any form of failure inside this device has the potential to prevent the clutch’s coil from being activated. Several systems additionally pass control head signals through the vehicle’s ECM/PCM for additional security. As a result, a partial failure of a control module can also result in the functioning of the compressor clutch.

How to Manually Engage an A/C Compressor Clutch

There are a variety of situations in which manually engaging the clutch of an air conditioning compressor might be beneficial. Perhaps the finest application of this technique is when seeking to establish whether or not the clutch itself has failed to function properly. If you provide the clutch coil with various hot and ground sources, it will be easier to identify the source of the compressor clutch-related difficulties.

The instructions below will guide you through the process of manually engaging the clutch component on your air conditioning compressor using the jump technique.

  1. Detach the Clutch Wire Pigtail:To begin, you must locate and disconnect the wiring pigtail that corresponds to the clutch assembly on your compressor. The wiring for this component is normally run from behind the air conditioning unit, near the front end of the vehicle’s compressor
  2. However, this is not always the case. To complete this task, you must first identify the power and ground wires that are present in this connection. In case of uncertainty, always refer to the manufacturer’s wiring schematic for your individual car. Make Jumper Wires:You will now need to make jumper wires for both the power and ground ends of the control circuit for your compressor’s compressor. An inline fuse must be included in the jumper wire that will be used on the positive side of the circuit if it is to function properly. It is also beneficial to attach alligator clips to the supply end of these jumper wires, so that they may be quickly linked to the terminals of your battery. It will now be necessary to connect your freshly fashioned jumper wires together in a logical manner. Please double-check that the fused jumper wire is connected between the positive wire of your clutch coil and the positive post of your battery. The remaining jumper wire should be connected by connecting it to the negative wire of the clutch coil and the negative post of your battery. You will now be able to establish whether or not your A/C clutch is defective based on the observations you have made. If your compressor’s clutch fails to engage when the compressor is jumped, it is recommended that you replace the compressor. The sudden rearward movement of the assembly’s clutch plate, which will be accompanied by an audible ‘click,’ will indicate that the clutch has engaged. If your A/C compressor’s clutch engages when jumped, further investigation will be required because the underlying fault is located in the system’s control circuit.

Replacing the A/C Compressor Clutch vs A/C Compressor

For a long time, replacing an A/C clutch was considered to be a more cost-effective option than replacing an A/C compressor in its whole. These days, however, this is not always the case. Most major automobile manufacturers now suggest that a compressor be replaced in the case of an A/C clutch failure, regardless of the brand. In reality, many of today’s A/C clutches are no longer capable of being serviced on their own. This needs the replacement of the compressor since it completely eliminates the option of clutch renewal.

In today’s market, aftermarket air conditioning compressors are available at a reasonable price, removing the financial benefit associated with clutch replacement.

Also see: Signs and Symptoms of a Faulty A/C Expansion Valve

Compressor clutch not engaging

If you’re here, it’s likely that you’ve attempted to recharge your air conditioning system and discovered that the compressor clutch was not engaging. If this is the case, you should attempt the troubleshooting steps provided here. This is a comprehensive description of how the system operates. After you’ve finished reading, check out this page to discover how to diagnose a compressor clutch issue.

Before you start, know the difference between a clutch type AC compressor and a clutch-less compressor

Late-model automobiles are equipped with a variable displacement air conditioner that requires no clutch. These compressors are not equipped with a clutch. During the whole time the engine is operating, the pulley is driving the compressor. During periods when the air conditioner is not in use, the wobbling plate within the compressor is in the 0° position, which means that the compressor is not compressing any refrigerant. The clutch type compressor is seen in older cars. The pulley rotates continuously while the engine is running, however the clutch plate remains motionless when the air conditioning is turned off.

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What makes an AC compressor clutch engage?

The three components of the air conditioning compressor clutch in an automobile are as follows: Start the engine by turning the air conditioning settings to the MAX AC setting. Then have a look at the compressor clutch from the front. Both the pulley and the clutch should be turning at the same time. When this occurs, it indicates that the clutch has properly engaged with the pulley. If just the pulley is rotating, but the clutch disc is not, this indicates that there is a problem somewhere in the transmission.

Why AC clutch won’t engage

It is possible that a blown fuse, an open in the wire to the clutch coil, a defective clutch coil, a weak ground, a low pressure switch lockout, or even an ill-functioning engine coolant temperature switch is the cause of the failure to engage the clutch.

AC clutch not getting power

A compressor clutch relay can transfer power in a variety of ways depending on the application. From the low-pressure switch on the wall. When the low pressure switch detects refrigerant pressure that exceeds the low pressure limit, it closes a switch that provides complete ground to the AC compressor clutch control coil and the control coil for the compressor clutch. The control coil energizes and shuts the relay connections, allowing power to be supplied to the AC compressor clutch coil through the control coil.

  • It is the PCM/responsibility ECM’s to monitor the low and high pressure switches, and if the pressures are within specification, the PCM/ECM will deliver ground to the AC compressor clutch relay control coil, otherwise it will not.
  • In each of these instances, the compressor clutch fuse would be the first thing you’d check throughout the diagnostic process.
  • The compressor clutch relay is grounded in a computer-controlled system since the computer is controlling the system.
  • Remove it from the vicinity of moving parts so that you can securely check for power and ground connections.
  • NOTE: Some automobiles only have a single power wire that connects to the clutch coil and nothing else.
  • You should disconnect the compressor clutch relay and check for power and ground on its control coil terminals in the socket if you aren’t obtaining battery voltage at that location.

Is the compressor clutch air gap set properly?

The air gap between the compressor clutch and the AC compressor clutch is important for the compressor clutch to engage. Read this article to find out more about the air gap in the AC compressor clutch.

Neverjumper across the low pressure switch?

In order to avoid catastrophic failure, air conditioning compressors require a steady supply of oil, and the refrigerant is responsible for transporting this oil throughout the whole system. As a result, automakers include a low pressure switch in their vehicles, which prevents the compressor from functioning when the system is short on refrigerant. Recharging instructions included with DIY recharging kits state that you should recharge through the low pressure port while the compressor is in operation.

Some do-it-yourselfers believe they can simply jumper the low pressure switch to compel the compressor clutch to activate while they recharge their batteries.

The compressor will be running with little or no lubrication if the low pressure switch is activated with little or no refrigerant in the system.

The same may be said for this situation.

It is NEVER a good idea to try to bypass the low pressure switch. This will force the compressor to operate with insufficient oil, which may result in the compressor being destroyed.

Is the AC system too low to charge?

If an air conditioning system is so low on refrigerant that it is unable to engage the compressor clutch, it is likely that it is too low to be refilled using a do-it-yourself kit. If the pressure is below the low pressure switch limit, this indicates that there is a significant leak in the system, as well as air and moisture in the system. If you attempt to fill the system with air and moisture that is still within, the system will not function properly. The moisture will cause the expansion valve or orifice tube to become brittle and break down completely.

Even if the charge pressures appear to be satisfactory, air in the system will limit cooling.

Can you check an AC charge level with the gauge on a DIY kit?

No, not at all. DIY kits include a low-pressure side gauge that is intended to offer both a static pressure measurement (when the engine is not running or the air conditioning is turned off) and a running pressure reading. However, just looking at the pressure data will not tell you how much refrigerant is in the system. You must also be aware of the temperature of the surrounding environment. The truth is that if you observe a static pressure measurement of 50 psi, all it informs you about the system is that there is some refrigerant present.

What does a low-pressure gauge static reading tell you?

I don’t believe that to be the case. DIY kits include a low-pressure side gauge, which is intended to offer both a static pressure measurement (when the engine is not running or the air conditioning is turned off) and a running pressure reading during operation. However, just looking at the pressure numbers will not tell you how much refrigerant is in the system! The temperature of the surrounding environment must also be known. The truth is that if you observe a static pressure measurement of 50 psi, all it informs you about the system is that it contains some refrigerant.

How to charge an AC compressor even if compressor isn’t running

It is possible to add extra refrigerant to the system without having to hot wire the low-pressure switch or turn on the compressor beforehand. It’ll simply take a long time to get there. In order to recharge the battery, connect it to the low-pressure (suction) port. The low-pressure tubing has a wider diameter than the high-pressure line, and this is always the case. Aside from that, the DIY kit fitting will only connect to the low-pressure port. Turn the ignition key to the RUN position and the blower fan to the HIGH setting.

  • After that, begin adding refrigerant.
  • The condensing action of the radiator fans will cause the refrigerant to condense and then return to its liquid state.
  • However, there is a good probability that some of the refrigerant will make it to the orifice tube and flow into the evaporator coil anyhow.
  • If you wait for a few minutes, you might be able to build up enough pressure to turn off the low-pressure switch.
  • For systems with expansion valves, the blower fan will prevent the detecting tube from shutting off the expansion valve while you are adding refrigerant to the system.

If this procedure does not work, you should take it to a professional. DO NOT connect the low-pressure switch to a hot wire. Compressor and clutch assembly for air conditioning systems Rick Muscoplat was born in 2014, and he is a musician. Rick Muscoplat posted a blog entry on

What Should I Do If AC Compressor Clutch Is Not Engaging

In case you notice that the air conditioning (AC) compressor clutch in your automobile is not engaging, you may need to get assistance from a professional. You will discover what you can do in such a case by reading this post. It is possible that the compressor clutch is not engaging for a variety of reasons. However, you will be unable to utilize your air conditioning system during this time. The compressor clutch is a critical component of your vehicle’s air conditioning system. As a result, it is a significant annoyance for the passengers when it is rendered useless.

In some cases, even if you use synthetic oil or coolant in your car, the compressor clutch might be destroyed as a result of electrical issues.

The majority of automobiles today employ an electromagnetic air conditioning clutch system to automate the operation of engaging and disengaging the air conditioning compressor.

Because you rely on your air conditioning system to perform flawlessly, we’ll walk you through the procedures you should take in such a case.

What is an AC Compressor Clutch?

It is the flywheel of your car’s engine that provides the power for an air conditioning compressor clutch to operate. Using an electromagnetic switch, it is controlled by a clutch system in which the shaft of the flywheel is engaged and disengaged from a spinning shaft of the clutch system. Your car’s air conditioning system is comprised of several critical components, two of which are the compressor and clutch. These parts, as well as other automotive components, should be regularly maintained in order to guarantee that they are always in proper working order at all times.

How Does an AC Compressor Clutch Work?

The clutch compressor is triggered in order for you to be able to utilize the air conditioning in your automobile anytime you wish. The clutch compressor is powered by an engine that is directly linked to the pump rotor of the compressor by means of a belt drive. The majority of automobile air conditioning systems make use of an electromagnetic clutch element that engages the compressor in order to spin the air conditioning unit. The compressor clutch is made out of a friction plate that is placed next to an electromagnetic coil to provide friction.

This generates a powerful electromagnetic force that pulls the coil in the direction of the friction plate and contacts the pump rotor, which in turn drives the compressor to operate.

How to Determine Whether the Compressor Clutch Is Working

The pump will not operate if the clutch does not engage with the compressor.

There will be no coolant or refrigerant to circulate through the air conditioning system in order to cool your vehicle if this occurs. To determine whether or not the clutch is functioning properly, use the following methods:

  • Set the air conditioning controls to the highest possible setting. Start the vehicle’s engine. Take a closer look at the front of your clutch purse. When you reach this point, the clutch and pulley should both be rotating. It is not possible for the clutch to operate when the pulley is the only spinning component.

Important pointers to remember if you are not an expert in automobile maintenance. According to Smart motorist, I recommend that you collaborate with a Car Diagnostic Tool. Most scan tools can be plugged straight into your dashboard and can even give you notifications when there is a problem with your vehicle’s electrical system. This is not only for problems with the air conditioning compressor, but for nearly all problems with the engine as a whole.

What Can Make The Clutch Not To Engage?

Some of the probable reasons why the clutch does not engage with the compressor are listed below.

  • An insufficient amount of lubricant in the compressor
  • Too much refrigerant
  • Not enough refrigerant Using the clutch sensor’s lockout as a default setting: Most current automobiles are equipped with air conditioning compressor clutches, which are controlled by the high- and low-pressure switches, as well as the amount of compressor oil, which is controlled by the fuse. This combination of three factors can prevent the clutch from engaging if the sensor detects that the compressor has inadequate oil, has too much refrigerant, or has too little refrigerant. Fuse that has been blown: To determine whether or not the fuse has been damaged, turn off the car’s engine and remove the fuse from the system. Check the fuse with a multimeter or any other instrument that can determine the fuse’s state of readiness. If the fuse has not been damaged, it should be returned to its original position.

What Should I Do If AC Compressor Clutch Is Not Engaging?

The following are some of the various methods that you might take to resolve the situation. The level of compressor oil may be easily determined by looking through the display glass. A red line in the display glass indicates that there is sufficient oil. If the level falls much below the red line, you will need to add more oil. It is essential that you choose an oil type that is appropriate with your specific compressor model. Make use of compressor oils that have been certified by the manufacturer of your air conditioning system.

  • A high pressure reading on the system indicates that the compressor has been overloaded with a refrigerant, which is not usual.
  • You should drain the refrigerant from the compressor if you are convinced that it has been overcharged.
  • Continue to bleed until you reach the desired degree of pressure.
  • If the pressure gauge records a lower pressure than required, the compressor is too low.
  • Recharging your refrigerant is possible with the use of repair kits, which come with detailed instructions on how to recharge the coolant.
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Conclusion

It is not difficult to determine whether or not your air conditioner’s compressor clutch is faulty. If you notice that anything is not operating properly with the air conditioning system, you can assess if there is a problem with it. If the DIY suggestions don’t provide the desired results, you may take the car to your technician and have him do a thorough inspection of the air conditioning system. When there is a problem with the system, the clutch on the AC compressor is not supposed to engage.

As a result, the next time the clutch fails to engage, be sure to check these components on a regular basis to avoid problems: We hope you found the information in this post useful!

What Should You Do When AC Compressor Clutch Not Engaging?

When the air conditioning compressor clutch in your automobile suddenly stops operating and does not engage, it might be an indication of a more serious problem since cold air would not be pumped into the engine as a result. In these cases, it is critical that you have your car evaluated by a skilled technician as soon as possible. A loosening of an AC compressor clutch can occur even if you are using synthetic oil or coolant in the industry. This can occur due to an electrical error fault in the system.

Occasionally, a clogged refrigerant circuit might also prevent the AC clutch from engaging in certain circumstances as well. To assist you in resolving this issue, we will provide some straightforward instructions in this post. You may be interested in the following:

  • The Top 5 Best Impact Driver Reviews and Buying Guide for 2019 are as follows: How to Choose the Best 8-Inch Car Subwoofer in 2019 and a Buying Guide Buying Guide for the Top 10 Best Multimeters in 2019
  • In 2019, what is the best OBD2 Scanner on the market? For You, Here Are the Top 10 Recommendations. Reviews of the Best Portable Jump Starters in 2019

How to Examine the AC Compressor Clutch​?

You will need to jump start your vehicle if your repeated testing have failed and you have been unable to manually engage the AC compressor clutch. In order to accomplish this, you must link the clutch’s wire directly to a power source. It would be a miracle if the air conditioner was able to blow cool air and the compressor was able to operate. The main source of the problem might be a malfunctioning pressure switch or a bad relay. If the clutch engages but the compressor does not turn, it is likely that a new compressor is required.

  1. Then you would demand an instant change service for the same.
  2. Observe the front of the compressor clutch to determine whether or not it is spinning, as well as whether or not the pulley is rotating.
  3. Bad clutch oil, a faulty ground, a low-pressure lockout, a blown fuse, or an open wire in the oil are all possible explanations for the problem.
  4. Because of a low-pressure switch in a few of automobile types, the compressor clutch relay turns on and off on a periodic basis.
  5. You should thoroughly inspect all of the components of the system in order to identify the source of the problem more quickly.
  6. You should remove it from other areas so that you can conduct a more thorough investigation of the ground and power.
  7. If you are unable to interpret the voltage values, you should look into the blown fuse.
  8. When the electricity is supplied from an alternating current switch to the fuse, it then travels straight to the clutch oil through low-pressure evaporator temperature in some automobile models.

Low Amount of Coolant​

If your repeated testing have failed and you are still unable to manually engage the AC compressor clutch, it may be essential to jump start the vehicle. A direct connection between the clutch’s wire and a battery will accomplish this. To be lucky, the air conditioner would be able to circulate cool air and the compressor would be able to operate. If a pressure switch or relay is malfunctioning, the primary problem is likely to be caused by this. If the clutch engages but the compressor does not turn, it is likely that you require a new compressor assembly.

  • In certain circumstances, you would demand an emergency change service for the same.
  • Observe the front of the compressor clutch to determine whether or not it is spinning, as well as whether or not the pulley is turning.
  • A faulty clutch oil, a weak ground, a low-pressure lockout, a blown fuse, or an open wire in the oil are all possible causes for this to occur.
  • Because of a low-pressure switch in a few of automobile types, the compressor clutch relay is turned on and off.
  • If you want to locate the problem as quickly as possible, you should thoroughly inspect all of the components of the system.
  • Make sure it is out of reach from other areas so that you can do a more thorough investigation of the ground and power.
  • You should investigate the fuse if you are unable to interpret the voltage values.
  • When the electricity is supplied from an alternating current switch to the fuse, it then travels directly to the clutch oil through low-pressure evaporator temperature in some automobiles.

Despite the fact that this should not be an issue, you must ensure that the AC compressor is properly lubricated in order to avoid a breakdown.

Our Recommendation​

While it is possible for the AC compressor clutch to not engage, we strongly advise you to utilize thebest car buffer, finest OBD2 Scanner, and best 10-inch subwoofer for your vehicle. You should not, however, disregard the condition of the vehicle’s engine. Whatever the case may be, you must keep an eye on everything, including the compressor, coolant, and oil, and avoid performing too many tests on your own. If you are unable to start your vehicle or engage the AC compressor clutch, contact a professional technician immediately for assistance.

Car air conditioner compressor clutch not engaging

Using the troubleshooting steps given here, you may determine if your car’s air conditioner compressor clutch is not engaging properly. The air conditioning compressor is engaged and disengaged by use of an electro-magnetic clutch, which is used by automobile manufacturers. The three components of the air conditioning compressor clutch in an automobile are as follows: When power is applied to the clutch coil, the magnetic field created by the current draws the clutch in and engages the compressor shaft.

  • As a result, you should begin by evaluating whether or not the compressor clutch is operational.
  • Then have a look at the compressor clutch from the front.
  • If the only thing that is rotating is the pulley, there is an issue elsewhere in the system.
  • In certain cars, the low pressure switch and the evaporator temperature sensor are used to control the compressor clutch relay, which is switched on and off.
  • Remove the electrical connector from the clutch coil and set it aside.
  • Use a digital voltmeter to check for battery voltage and good ground at the connector when the engine is running and the AC is set to the maximum setting.
  • If the fuse is good, replace the compressor clutch relay.

Some automobile manufacturers use the PCM or ECM to trigger the relay control coil ground, while others do not.

When electricity is applied to other cars, it passes via the air conditioning switch and into the fuse, and then passes through the fuse, past the low pressure and evaporator temperature sensors, and into the clutch coil.

As a result, automakers include a low pressure switch in their vehicles, which prevents the compressor from functioning when the system is short on refrigerant.

However, if the system’s refrigerant level is too low, the clutch will not engage.

AWFUL DECISION.

Even if you are successful in getting it to accept a charge, it is possible that you have already destroyed the compressor.

This will force the compressor to operate with insufficient oil, which may result in the compressor being destroyed.

Due to the fact that there is likely air and moisture in the system, the leak is significant and should be addressed.

After that, the system should be completely evacuated to ensure that all air has been removed before it can be recharged.

Adding extra refrigerant is possible without having to hot wire the low pressure switch and operate the compressor at full capacity.

In order to recharge the battery, connect it to the low pressure (suction) connector.

In addition, the DIY kit fitting will only attach to the low pressure port, not the high pressure.

To activate the radiator fans, turn the air conditioner up to its maximum setting.

Depending on whether your car is equipped with an orifice tube system, the refrigerant gas will pass through one of the open compressor reed valves before entering the condenser coil.

Because the compressor will not be functioning, there will be no pressure in the system.

Whenever a liquid enters the evaporator, it will boil and change back into a gas as long as the blower fan is operating.

Try starting the engine and inspecting the compressor to see what happens.

If this procedure does not work, you should take it to a professional.

Compressor and clutch assembly for air conditioning systems Sachin Naireautorepair.net was founded in 2015.

Technical service bulletins, code definitions and step-by-step testing, as well as easy-to-understand wiring diagrams, are all included, as is an explanation of how the systems are designed to function.

Take a look at these!

Furthermore, you must access to the most recent technical service bulletins so that you do not spend time and money repairing parts that may misbehave as a result of a software bug on the part of the manufacturer.

They will only serve to mislead you.

Get a 1-Month (31 Days) subscription for $16.99, a 1-Year (Best Value!) subscription for $25.99, or a 4-Year (Best Value!) subscription for $39.99. I like the wiring diagrams on Eautorepair.net to the difficult-to-read factory schematics on Alldatadiy because they are more user-friendly.

Diagnose Car AC Clutch Wont Engage Problems

The Car’s Air Conditioning Clutch Will Not Engage When the car’s air conditioning clutch refuses to engage, you switch on the air conditioning and patiently wait for cold air that never arrives. When you turned on the air conditioning from the control panel, you undoubtedly felt something a bit different. When the compressor kicks in, you’ll frequently hear a click and feel the engine struggle to keep up with the additional strain on the compressor. Manufacturers try everything they can to conceal both of these signs of a fully functioning air-conditioning system, but it is impossible.

When you open the hood of your car with the highest air conditioning turned on, you may frequently discover that the car’s air conditioning clutch is not engaged.

That front plate is connected to the compressor driveshaft and must be engaged against the pulley in order for the compressor to work.

Proper Car AC Clutch Operation

Car Air Conditioning Compressor Clutch Diagram In order to find out what is wrong with the car’s air conditioning system, we must first understand what happens when the compressor is activated from the AC climate control panel on the dashboard. To activate the compressor, as you can see from the image on the right, we have three independent elements that must all work together in the proper manner. The compressor clutch assembly is located at the front of the vehicle and connects to the driveshaft.

The innermost component is a strong electromagnet, which pushes the clutch against the rotating pulley as the clutch is engaged and released.

This results in the production of an audible click sound.

Because of this, it is important to open the hood and have a buddy switch on and off the air conditioning to visually check whether or not the clutch is locked in place.

Where to Start AC Clutch Diagnosis

When I come across an AC clutch that isn’t engaging, the first thing I look for is the electrical connector that connects to the compressor. The compressor for the air conditioning system creates a lot of heat and vibration. All too frequently, this potent mix can take its toll on the electrical connection that is used to transmit the signal. You may even try wiggling the connector to see whether the AC clutch is activated by wriggling the connector. The next step is to check that there is electricity and a good ground present.

  • It should be noted that in a one-wire system, the electromagnetic coil is grounded through a case ground.
  • If you have a 12 V request signal as well as a good ground, the problem is most likely in the compressor section of the system.
  • Nonetheless, a small number of autos are prone to malfunctions in this region.
  • More information about Honda VTEC difficulties may be found here.

In fact, because of the high demand for compressors, replacement parts for these devices are available at cheap costs. When the compressor fails to kick on, it is more probable that there is a lack of AC requestsignal at the compressor connector, than than the other way around.

Common Problems with the AC Request Signal

Low Refrigerant Pressure Switch on an Air Conditioning System As previously discussed in the first phase of diagnosis, the most common reason for the compressor failing to turn on is due to the compressor not getting a power signal. Despite the fact that the list of likely reasons is incredibly large, we are lucky in that a few frequent difficulties account for more than 75% of the concerns. Let me begin by stating the most optimistic situation. Automobiles that are becoming older will have problems with the air conditioning relay failing more frequently.

  1. It’s important to note that this is slightly model specific.
  2. I have a full post on how to test the car’s air conditioning relay and I hope this accurately depicts your situation.
  3. With an affordable air conditioning service, you can find out how much Freon is still in the system and make the necessary adjustments.
  4. If the Freon seeps out, the lubricant also leaks out.
  5. It is possible for these pressure sensitive switches to fail.
  6. That is something you should never do.
  7. Furthermore, simply turning it on can be devastating.
  8. In order to address this issue, a set of air-conditioning manifold gauges should be connected to both the high and low pressure test ports.
  9. Many people will simply toss in a can of Freon and hope that the system will continue to function for a long.
  10. The length of time it takes for the recharge to complete becomes an indication of the severity of the leak.
  11. This is another another topic that I went into great detail about.
See also:  Tire pulls to one side? (Suits you)

Uncommon AC Compressor Clutch Problems

There are certain automobile manufacturers who are far too clever for their own advantage. Take a difficult system and make it even more complicated by adding more variables. These automobile manufacturers transmit an AC request signal to the vehicle’s main computer. Despite the fact that the reasoning behind it is still true, the actual implementation is a weak link in the chain. In other words, a faulty ECM might result in the air conditioning system failing to function. A request signal for air conditioning has also been included in certain vehicles, which is generated by the temperature control panel or body computers.

Please see the following link for an article about Chevrolet computer faults that prevent the air conditioning from turning on.

In addition, we go into much greater depth on repairing ancient automotive air-conditioning systems and the usual issues that arise as a result of them.

For those who are interested in other automotive themes, the fix my old vehicle homepage is a good place to begin your search. Because I am an Amazon Associate, I receive money when people make eligible purchases.

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How to Jump AC Compressor Clutch Correctly

This guide is for you if your vehicle’s air conditioning clutch is not engaging. We will explain the AC compressor, the AC clutch, and any difficulties that may arise as a result of these two components. There are a variety of factors that might cause an AC compressor clutch to fail. There are a variety of causes, ranging from basic to complex. Once you have finished reading this article, you will be able to diagnose and determine the cause of the failure. You will also learn how to jump the AC compressor clutch in order to avoid being caught in an unexpected AC compressor clutch failure situation.

What Causes AC Clutch Not to Engage?

The AC clutch must be understood before we can go into depth about the causes for its failure to engage, thus it is critical to understand what the AC clutch is. The AC clutch is responsible for turning the AC compressor. A power source is provided by an auxiliary belt that connects the motor to the flywheel and provides the motor with its power. A clutch system is in charge of controlling the AC clutch. An electromagnetic switch connects the shaft to the flywheel’s spinning shaft, which allows the flywheel to rotate.

  1. To get a satisfactory cooling effect, it is therefore necessary to keep the system in excellent working order at all times.
  2. Previously, we indicated that in order to get the compressor to turn, the clutch must be powered and engaged with the rotating pulley.
  3. When the user clicks the AC button, the electromagnetic coil is electrified and is firmly linked to the pump rotor by the powerful electromagnetic force that is generated.
  4. Have we gained a better understanding of what an AC clutch is and how it operates?
  5. Also see: Why isn’t my car’s air conditioner blowing cold air when it should?

Insufficient AC compressor oil

Before we get into the specifics of why the AC clutch isn’t engaging, it’s important to understand what the AC clutch is and what it’s for. In order for the AC compressor to turn, a clutch must be installed. A power source is provided by an auxiliary belt that connects the motor to the flywheel and provides the necessary torque. A clutch system regulates the operation of the AC clutch. An electromagnetic switch connects the shaft to the rotating shaft of the flywheel. It is a component of the AC compressor, which serves as the system’s central nervous system (the heart).

When utilizing the car’s air conditioning, it is necessary to turn on the car’s air conditioning compressor.

The compressor clutch is made out of a friction plate that is placed next to an electromagnetic coil to compress the air pressure.

It then causes the compressor to spin, causing the refrigerant to be compressed further.

Knowing what an AC clutch is and how it works, we can go on to the next step: Let’s take a look at some of the possible reasons why the AC clutch could not be engaging. You might also be interested in: Why is my car’s air conditioner not blowing cold air?

Low Refrigerant

The most typical reason for the AC clutch not engaging is due to a clogged air filter. When the refrigerant level falls below a certain threshold, the low-pressure switch prohibits the compressor from turning. Therefore, it is unable to prevent the internal components of the compressor from becoming damaged. Clutch Sensors Are Locked Out: Most current automobiles have their air conditioning clutches switched on and off using high-pressure and low-pressure switches, as well as the amount of the compressor oil in the reservoir.

Burnt Fuse/Bad Relay

The most common reason for the AC clutch not engaging is due to a clogged air intake. Low-pressure switches are used to prevent the compressor from operating when the refrigerant level is low. Therefore, it is unable to prevent the internal components of the compressor from becoming damaged. Clutch Sensors Are Locked Out – The high-pressure and low-pressure switches, as well as the level of the compressor oil, are used to turn on and off most modern automobiles’ air conditioning systems. It is impossible for the clutch to engage if any one of these three factors is not functioning correctly.

How to Examine the AC Compressor Clutch?

Assume that the compressor clutch is not engaging; here is how to inspect the compressor clutch on an air conditioning system. The compressor will not turn if the pump is not operating properly. When this occurs, it indicates that there is no refrigerant moving throughout the whole system, and the air conditioning system will not function correctly. Examining the air conditioning compressor is not a difficult procedure. To begin, turn on the air conditioning and the ceiling fan to their highest settings.

If the only thing that is spinning is the pulley, this indicates that the clutch has been destroyed, and the air conditioner will not function correctly.

Also see: Car overheats while the air conditioning is turned on and the vehicle is idling

How to Jump AC Compressor Clutch

As we reviewed the factors that might cause the clutch to fail to engage correctly, one of the factors that came up was the presence of high and low oil pressure switches, which protect the compressor from being harmed as a result of poor operating circumstances. Therefore, in order to determine whether or not the compressor has failed, it is necessary to detach its connection cable from the other components. Connect a voltammeter to the connection and use it to measure the voltage of the battery and the voltage of the earth.

Make Sure Compressor Have Sufficient Oil

High/low oil pressure switches, one of which was suggested as a cause of the clutch failing to engage correctly, were also mentioned. These switches prevent the compressor from being destroyed as a result of improper operating circumstances. Remove the compressor’s connection cord from any other components in order to determine if the compressor has failed.

To test the battery voltage and the ground, connect a voltammeter to the connection and take measurements. It is necessary to examine the AC relay and fuse if no readings can be obtained.

Set the Amount of Refrigerant

The amount of refrigerant in the air conditioning compressor should be sufficient to fulfill the manufacturer’s specifications. This creates the optimal stress on the internal compressor parts, which helps to keep them from becoming damaged. The refrigerant is measured using a pressure gauge that is mounted on the high-pressure and low-pressure rails of the air conditioner. It is compared to the suggested value and attempts to achieve a balance between the two.

Jump Start the Clutch

After you have completed all of the aforementioned inspections, you will need to know how to manually engage the clutch. Unplug the single wire connector on the front of the compressor, and then connect a jumper wire to the wire that was previously detached from the compressor on the backside. Attach the other end of the jumper to the positive terminal of the car battery, and it will assist you in manually starting the compressor. You may also be interested in:How Often Should You Change Your Cabin Air Filter – Everything You Need To Know

Frequently Asked Questions (FAQs)

If the AC compressor clutch does not engage immediately when the AC switch in the vehicle AC panel is turned on, you should check the levels of the refrigerator and compressor oil in the car AC panel. Unplug the single wire connector on the front of the compressor and connect a jumper wire to the wire that you just pulled from the compressor on the back side of the compressor. Connect the other end of the jumper’s wire to the positive terminal of the vehicle’s battery to complete the installation.

Q. How Do I Know If My AC Clutch Relay Is Bad?

There are a number of symptoms that might assist you determine whether or not the AC clutch relay is malfunctioning. The most evident symptom of a faulty AC clutch relay is that the air conditioner’s compressor does not come on. You should hear a click sound when the clutch is engaged in normal circumstances. You will not be able to hear this clicking sound if the compressor is not receiving sufficient power as the consequence of the failure of the relay. In addition, the absence of air coming from the air conditioning system is another indicator of a faulty clutch relay.

Q. Should AC Compressor Clutch Spin Freely?

When the AC compressor clutch is completely disengaged, the compressor may freely spin. When the compressor and the pulley are engaged, it will also freely spin on its axis. If, on the other hand, the AC compressor clutch spins freely every time, and the compressor fails to come on, this is an indication that it is not engaging, and the compressor will need to be replaced.

Q. Will My AC Clutch Engage With Low Freon?

No, the AC clutch will not activate if the Freon tank is empty or nearing its lowest level. In order to prevent the AC clutch from engaging, the low-pressure switch must be activated.

Otherwise, the compressor will not spin. This inhibits the compressor from turning on or starting up. There is a good chance that the Freon level is low because to leaking. Once the Freon has been refilled, inspect the system for leaks to ensure that the problem does not recur.

Final Words:

It is not difficult to figure out what is going on with your compressor when it stops working. Simply following the inspection stages will provide you with the necessary information to determine the source of the problem. In the event that you become perplexed, do not hesitate to contact the local mechanic or professional to have your automobile repaired, as doing so will save you money and time. Regular checks of the compressor oil and the refrigerator level are recommended in order to avoid difficulties in the future.

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