Honda AC clutch doesn’t engage? (TOP 5 Tips)

When you encounter a Honda AC clutch doesn’t engage condition, the problem could be: low refrigerant charge, failed AC compressor thermal protector, or faulty AC clutch relay. To start, check high and low system pressures to make sure you’re above the high and low-psi cutoff limits.

  • When you encounter a Honda AC clutch doesn’t engage condition, the problem could be: low refrigerant charge, failed AC compressor thermal protector, or faulty AC clutch relay. To start, check high and low system pressures to make sure you’re above the high and low-psi cutoff limits. If so, check for Honda AC compressor clutch engagement.

What would cause an AC clutch to not engage?

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.

Can you manually engage AC compressor clutch?

Unplug the single wire connector on the front side of the compressor. Take the fused jumper wire and connect its one end to that side of the wire connector that was connected to the compressor. It will supply the battery voltage to the compressor clutch, allowing it to engage manually.

How do I manually jump my AC compressor clutch?

At the compressor’s front side, unplug the single wire connector, take a jumper wire and attach it to the wire that you just disconnected from the compressor. Connect the other end of the jumper’s wire to the positive terminal of the car battery. This will enable the compressor to start manually.

How do I know if my AC 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.

Will low Freon cause AC clutch not engage?

Being Low on Refrigerant Being low on the coolant might be another reason why you will find the AC compressor clutch not engaging. Low coolant content or pressure can be dangerous for the system of your car. The compressor relies on the oils in the refrigerant to cool down parts and lubricate the mechanical parts.

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. Check the blower motor amperage and compare to the name plate.

How do I know if my AC compressor is not working?

Before AC compressors stop working altogether, they often display warning signs, like: Blowing warm air. Frequently tripping the circuit breaker. Shaking when the system is started.

How do you know if your AC compressor is not working?

Four Signs Your Car’s AC Compressor Is Going Bad

  1. Odd Sounds. You might hear some strange noises when you flip on your vehicle’s air conditioner and if you do, it’s probably the compressor.
  2. Hot Air. The whole point of turning on your vehicle’s AC is to get cold air to come through the vents.
  3. Fluid Leaks.
  4. Stuck Clutch.

Can you replace AC clutch without removing 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. You may need to replace compressor.

A/C Compressor Won’t Engage

Your Honda dealer’s technicians are unable of diagnosing anything as simple as an air conditioning system, which I find incomprehensible. It’s a terrible situation. I previously wrote about an alternate refrigerant that I am currently utilizing in my Honda Civic with excellent results. I’m able to keep the air conditioning running all of the time while putting very little strain on the engine. It operates at less than half the pressure of R134 and becomes COLDER as a result. In any case, it is possible that the air conditioner will not start because: the compressor clutch is electrically open, which means it will not engage.

Once again, it will not start.

Now that I think about it, there is a problem with some civics classes.

As you are aware, the ECU shuts down the air conditioning when you step on the pedal too hard in order to preserve electricity.

Last but not least, the fuse.

This is something a decent tech could sort out in 10 minutes.

I complete all of my own work.

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

So, what should I do if the AC compressor clutch is not working properly? Consider the following scenario: you have an automobile, and everything works well. When you switch on the air conditioner, on the other hand, only warm air is blown. What may be the source of the problem? If your air conditioner’s compressor clutch suddenly stops operating and does not engage, this might be the cause of your air conditioner’s failure to perform correctly. It is possible that the compressor is experiencing a significant problem or a minor one.

You may want to perform a visual check of the AC compressor clutch to see if you can identify what is causing the clutch to fail to engage.

Even if you have recently refilled your air conditioning system with refrigerant, if the AC compressor is unable to function properly, you may experience warm air.

We’ll go through some of the probable issues and remedies for a compressor clutch that isn’t working properly. It might be caused by anything from a blockage in the refrigerant circuit to a faulty wiring harness. Let’s make sure your air conditioner is in good operating order before we get started.

Do a Visual Inspection

When the engine is turned off:

  1. In order to test the clutch, you may either acquire a power probe or try to make do with a wire, as seen in the video above. In order to avoid purchasing anything, test the air conditioner with the engine running, as stated later. Also check to verify if the AC clutch engages when power is applied. Warning: If you are confused about which circuits to test, get assistance or try a different way to avoid causing more issues. Examine the compressor and make certain that the belt that passes across the pulley is in excellent working order – if the belt is slipping or has become worn, it will need to be tightened or replaced. Keep an eye out for corrosion around the clutch plate. When rust appears on the compressor, it might be an indication that it is old and may just need to be replaced since it has worn down and become damaged. Check the wiring to the clutch – if the wires are not correctly connected, it might have an influence on how well the compressor operates. In order to produce enough electricity, the wires must be properly connected and in excellent shape. Additionally, the high pressure switch and evaporator temperature sensor may be broken or have loose wires
  2. Therefore, It is critical for you to understand the fundamentals of a few components before proceeding to the next phase. Because of the low-pressure switch, the compressor clutch relay is turned on and off in some of the vehicles. In a controlled system, the relay, on the other hand, is grounded by a computer. In order to diagnose the problem more quickly, thoroughly check all of the system’s components. You might get a digital multimeter and use it to verify the voltage and ground at the relocated connection. If you are unable to obtain a voltage measurement, the fuse should be checked. It is possible that the automobile will need to be started even if the engine is not running. If everything is in working order with the fuse, you should check the clutch relay. Removing it allows you to examine the relay for power and ground by pulling it out of the socket and checking its terminals. Make a visual inspection of your air conditioning system for leaks – check for leaks coming from the condenser, receiver, or any other spots where metal pipe connections are formed.

What to look for during your visual inspection

Take a look at these illustrations for more information on how your air conditioning compressor operates and what to check for. Whenever possible, allow the engine to cool completely before working on or inspecting the engine. When physically checking parts, wearing gloves will be quite beneficial. This image is from of

Turn On the Engine Inspection

After you have completed your visual check, start the engine by pressing the following button: 1. With the engine running, set the air conditioning up to maximum – you’ll be checking for any problems with the serpentine belt. After that, have a check at the compressor clutch. Following that, you’ll need to wait for a few minutes for the compressor clutch to engage and begin spinning as well, which may take up to a minute. 2. If you’ve waited many minutes while the engine is running and the air conditioning is set to the highest setting and the clutch is still not engaging, there’s something wrong with the vehicle.

  1. 3.
  2. Here’s a video that demonstrates how to locate an air conditioning leak using a fluorescent dye: How to Find an AC Leak.
  3. Image courtesy of: You may also experiment with a refrigerant leak detector before purchasing a can of halt leak.
  4. This is an example of a refrigerant leak detector.

Being Low on Refrigerant

Another possible explanation for the AC compressor clutch not engaging is a low level of coolant in the system. The sensors in your air conditioner will determine whether or not the pressure is correct. If something is turned off, the air conditioning compressor may not turn on. Low coolant content or pressure can be hazardous to the operation of your vehicle’s cooling system. In order to cool down components and lubricate mechanical parts, the compressor relies on the oils contained inside the refrigerant.

An overcharged air conditioning system will not have the proper pressures, resulting in the clutch failing to engage and the pressure wearing out parts more quickly.

This is a common practice.

Actually, at this point, it’s possible that you’ve done some major damage to your compressor. A lack of oil in the compressor might cause it to fail permanently, necessitating the need for more significant repair and replacement.

Tip on Adding Refrigerant

Use refrigerant only if you have done your research and are confident in your comprehension of how much pressure your vehicle’s air conditioning system demands. Consider reading this article on AC system oil if you feel that a significant amount of AC refrigerant has been leaking from your unit. It is possible that seeing a professional to evacuate your air conditioning system (as this is the only legal technique to remove refrigerant) before adding refrigerant is the best answer. You can be confident that you are adding the right amount of refrigerant to your system this way.

  • A diagnostic gauge for the air conditioning system will provide you with a clear idea of what the high and low pressures are.
  • When there is a leak, moisture and air are allowed to enter the system.
  • This has the potential to destabilize the system.
  • Follow the instructions on the diagnostic tool carefully when attaching it to your air conditioning system.
  • As the clutch engages, the air conditioner should cycle the refrigerant, causing the pressure measurement to vary somewhat.
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Is My Compressor broken?

Image courtesy of: Several factors can contribute to the inability of your compressor to function properly. If you’ve checked the electrical system and the clutch and found nothing amiss, it’s possible that your compressor has an internal mechanical or electrical fault that has to be addressed. If the compressor is faulty, I would propose that you replace the complete unit with another one. The reason for this is because by replacing the old one with a new one, you will most likely save both time and money.

  1. When removing one and replacing it with a new one, the work is time-consuming.
  2. Furthermore, purchasing a new compressor is not significantly more expensive than having an old one fixed.
  3. If you’re interested in installing your own compressor, you should watch this video (How to Replace an AC Compressor in Your Car) first.
  4. (How to Unlock an AC Compressor That Has Glocked Up)

Other Parts to Check

It is also necessary to inspect the condenser surrounding the connection where the compressor’s output line is connected tothe condenser if your compressor has become unresponsive. It is likely that you may uncover a little piece of metal that can block your condenser. Therefore, you may need to replace it if you are unable to remove the metal fragments from it. It is possible to examine thedrier / receiver, which helps filter and store the liquid refrigerant as it begins to convert back into a gas, for sounds or foul odors coming from the air conditioning system inside the car.

  • Typically, the evaporator coil is situated within the automobile cabin, and air is forced over it to cool the air down.
  • It may be prohibitively expensive to replace, but if it is leaking or damaged, it should be repaired or replaced.
  • If it is not operating correctly, you may notice that the AC compressor does not shut off and that frost has accumulated around the AC vents.
  • It is possible that replacing this valve will not be prohibitively expensive, and it will certainly be a less difficult process than replacing an air conditioning compressor.

The fuse box may contain fuses that are related to your air conditioning compressor. If a fuse blows, it is a simple matter to replace it. Image courtesy of:

Using a Mechanic

When you’ve thoroughly studied the problem and conducted your study and have decided that you do not want to perform the repair work yourself, you may feel more confidence when contracting the service to a technician. Because you are more knowledgeable about what is wrong with your vehicle and what to expect when repairs are made, you can communicate with the technician in a way that demonstrates that you are expecting a quality service for the price you are paying. Asking them to repair an air conditioner compressor will cost a little money, but it will hurt less for certain people who are familiar with the process of repair.

Because this sort of profession has a significant learning curve, extreme caution should be exercised.

Our Advice

Start with the most basic methods of checking the AC compressor to see if they will aid you in determining what is wrong with it. Then you can go on to do other inspections until you no longer feel interested or competent to do so any more. You want to be able to finish a work that you start so that you aren’t irritated and don’t have to spend time addressing difficulties that you made by mistake. Starting small might assist you in determining what you are capable of and willing to undertake.

The best option in most cases is to call on the help of a buddy who has previous expertise starting and engaging the compressor’s clutch on their own.

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. But first, let’s go over some of the fundamentals of an air conditioner compressor clutch.

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. A discharge valve should be located near the gauge. Continue to bleed until you reach the desired degree of pressure.

The amount of coolant in the compressor should be checked to see whether it is too low by looking at the pressure gauge on the high-pressure side of the compressor. If the pressure gauge records a lower pressure than required, the compressor is too low. You can find out what degree of pressure to use in your automobile by consulting the owner’s handbook for your vehicle. 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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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!

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.

If this is not the case, continue reading to learn about some of the most typical reasons of a car air conditioning clutch that will not engage.

Where to Start AC Clutch Diagnosis

Diagram of the car’s air conditioning compressor clutch The first step in figuring out what’s wrong with the car’s air-conditioning system is to understand what happens when the compressor is activated through the AC temperature control panel. To activate the compressor, as you can see from the illustration on the right, three independent elements must all work together in the proper manner. The compressor clutch assembly, which links the driveshaft to the front of the engine, is the first component.

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

This results in the production of an audible click noise.

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

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.

People are frequently tempted to dump a can of leak sealant into their air conditioning system. This is another another topic that I went into great detail about. See my thoughts on how effectively air-conditioning stop-leak products work in this article.

Uncommon AC Compressor Clutch Problems

Some automotive manufacturers are too smart for their own good. They take a complex system and make it even more complicated. These automakers send an AC request signal throughthe car’s main computer. Although the reason behind it remains valid, the implementation represents a weak link in the chain. In other words, a bad ECM can cause the air-conditioning not to work. In other cases, car designers built in an AC request signal that’s generated from the climate control panel or body computers.

As an example, here’s a link to an article aboutChevrolet computer problemsthat stops the air-conditioning from coming on.

In addition, we dive much deeper into fixingold car air-conditioning systemsand the common problems associated with them.

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How To Manually Engage AC Compressor Clutch: The Easiest Methods

Tsukasa Azuma is the author of this piece. Comments received since the last update on December 24, 20200 Many major problems can arise in a car, and one of these is a malfunctioning air conditioning compressor clutch. When this component is not functioning properly, the engine does not receive sufficient cold air flow, which might result in some serious issues. Knowing how to manually engage the AC compressor clutchcan save you money by avoiding a trip to the mechanic’s shop. In addition, you should be familiar with how to inspect the clutch to determine if it is malfunctioning or not.

How To Examine The AC Compressor Clutch?

Failure of an air conditioning compressor clutch may result from the use of low-quality oil, but it may also occur even if you use synthetic oil and high-quality coolant. It has been reported that the clutch does not engage in a few instances owing to a blocked refrigerant circuit. If you wish to check for problems with an air conditioning compressor clutch, use the following techniques:

Working Method 1

Before starting the engine, make sure all of the air conditioning settings are set to the maximum setting. Examine the condition of the clutch’s front side to determine its age. Additionally, check to see whether the clutch and pulley are rotating. It is possible that the compressor clutch is experiencing a problem if just the pulley is turning. The problem might be caused by a blown fuse, poor clutch oil, low-pressure lockout, or an open wire embedded in the oil, among other things. Before examining the compressor, turn the air conditioner up to its maximum setting.

Working Method 2

In some automobile models, a low-pressure switch might cause difficulties with the compressor clutch’s relay, which you should be aware of before moving on to the next phase of the diagnostic process. The relay is grounded by the system’s computer, but it is susceptible to being turned on and off by a faulty switch. An in-depth examination of the system and its components can assist you in identifying the root of the malfunction. It is necessary to disconnect the connection cable from the clutch oil at this phase.

Make use of a digital voltmeter to check the ground and battery voltage at the end of the disconnected connection cable. If you are unable to interpret the voltage readings, proceed to examine the fuse. If the fuse is found to be in working order, proceed to the clutch relay.

Working Method 3

When the air conditioning system is turned on, electrical power travels from the AC switch to a fuse before being passed to the clutch oil through a temperature differential between the low-pressure evaporator and the clutch oil. This means you must make certain that the compressor has sufficient oil to perform correctly. The next step is to engage the clutch after you have determined that there is an issue with it. The next section explains how to manually activate the AC compressor clutch at your house.

  • The Simplest Method for Using a Recharge Kit for Your Car’s Air Conditioning
  • Do you want to recharge your car’s air conditioning system at home? Take a look at this

How To Manually Engage AC Compressor Clutch

It’s not difficult to engage the AC compressor clutch at home; it’s not rocket science. There are a handful of ways you may resolve the issue in order to restore proper operation to the air conditioning system.

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Method 1: Add More Coolant

In what situation does an air conditioning compressor fail to activate the most frequently seen reason? There is a low level of refrigerant. When the amount of coolant in the system drops below a certain point, the low-pressure switch prevents the compressor from rotating. When the system’s antifreeze level is low, how do you manually activate the AC compressor clutch? Easy. Simply increasing the amount of refrigerant will solve the problem. It is possible to restore the normal working of the compressor clutch by adding a can of R134a refrigerant to your car’s system if it is compatible with this type of refrigerant and the low-pressure switch has been disabled.

Inadequate lubrication has the potential to cause harm to the compressor.


Method 2: Jump-start The Clutch

For older vehicles that are not compatible with the R134a type, the procedure is a little more complicated. Only a few minutes are required to get things going, and the procedure will not last longer than that: Check the oil level in the compressor to make sure it is enough. If the level is below the typical point, more oil should be added. Check the owner’s handbook to ensure that you are following the recommended procedures for monitoring the compressor oil level and refilling the compressor.

Take the fused jumper wire and attach one end of it to the side of the wire connector that was connected to the compressor, and the other end to the other side of the wire connection that was not connected to the compressor.

Remove the jumper wire from the battery.

It is not necessary to turn on the air conditioning system in order for this approach to function.

Method 3: Replacing The Clutch

When the clutch engages but the compressor does not spin, it is a warning indication that something is wrong.

In this situation, it is possible that changing the compressor clutch is the only option. A faulty AC compressor clutch must be repaired as soon as possible. In the event of a delay, substantial damage to the air conditioning system and engine may result.

AC Compressor Clutch will not engage

Hi, I’ve just installed a new compressor on the 07 RTL. (I grew up working in the car air conditioning industry in the 1970s.) While driving, something occurred to the old clutch/pulley, causing the AC to fail. Purchased a new compressor; the old one still has suction, but the pulley is really noisy. I DID NOT REPLACE THE CONDENSER OR THE EXPANSION VALVE; I mention this to provide information regarding connections, joints, sensors, and other components that were not replaced during the repair.

  • (Of course, fresh lubricated o-rings were used, and vacuum was drawn, among other things) In addition, the new wireconnector was a perfect match for the previous connection that was linked to the fan shroud.
  • I connected the compressor wire straight to the battery, and everything worked well after that.
  • It has recently been discovered that the “pressure switch” center wire, which is coupled to a high-side tube but is also utilized for low pressure, has a voltage value matrix that determines the voltage values that come from the wire.
  • I investigated the relay box under the hood and found it to be as follows: 1) Using a voltmeter, I tested the amount of electricity entering into the relay.
  • The other two black relays (1 is a horn) have been swapped out, and neither of them activate the clutch.
  • While it is not probable that I have high pressure in the system at this time, and I did not have high pressure before or after the failure of the previous clutch/pulley, I have not removed that plug and attempted to jumper it at this time.
  • Despite the fact that wiring schematics indicate only one 7.5a fuse that supplies many relays, I did not examine the fuses under the steering wheel.

There’s no need to go down to the basement and meddle with it.

EDIT: I discovered a wiring schematic for a 2006-2008 Honda Civic on the internet.

The wiring is the same as for the condenser fan.

1) I’ve noticed that when the air conditioning is turned on at the control panel, the condenser fan turns on but the clutch does not.

Secondly, I only monitor voltage going into the AC Clutch Relay while the engine is running – there is no voltage when the ignition is just switched on.

When the relay is in the on position and the engine is running, I measure NO Voltage on the clutch wire at the shourd – this indicates a defective relay is in the circuit (even though I have tried 2 other relays – one being the horn relay, which operates the horn correctly). thx

A/C Clutch not Engaging on my Honda Civic?

I have a 2000 Honda Civic 1.6L iSR MTX that I purchased lately and have since replaced the engine with a different one. Although I haven’t driven it much, I had the feeling that the air conditioning was not performing as efficiently as it should. However, I just drove it on a lengthy road trip, and the air conditioning worked well for the first 230 kilometers. Then I pulled over somewhere, got back in the car, and discovered that the air conditioning was completely non-functional. As in, the A/C indication light illuminates, air is forced through the vehicle, and the A/C radiator fan turns on, but no cooling is achieved.

  • A minor decrease in engine rpms would normally be expected when the compressor kicks on, but before the IAC kicks in to compensate for the loss of speed.
  • Are these assumptions acceptable, and if so, how can I check them, and what are my available repair options?
  • EDITI just went for a trip in the car and chose to turn on the A/C for a second time just for fun.
  • When I pulled over to park, I performed a quick test in which I switched on the fan at full speed, waited a few seconds for the rpms to stabilize, and then turned on the air conditioning.
  • When it wasn’t functioning yesterday, I called.
  • I had the hood open and was right next to the compressor.
  • Is it possible that a stray wire is preventing the clutch from engaging?

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.


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 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 to the difficult-to-read factory schematics on Alldatadiy because they are more user-friendly.

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