AC compressor clutch won’t engage – Toyota?

Car models
  • If the AC compressor clutch won’t engage on your late model Toyota and you find a B1479 Flow Control Circuit trouble code stored, the problem is usually a bad flow control sensor. Toyota uses the AC flow control sensor to detect the amount of refrigerant flow through the compressor.

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.

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.

Is the AC compressor clutch controlled by a relay?

The air conditioning clutch relay transfers power, like a switch, from the interior A/C controls of an automobile to the A/C compressor, engaging the compressor clutch.

How do I know if my AC 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 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.

Why does my car AC compressor not work?

If the AC compressor doesn’t turn on, the most common culprit by far is low AC refrigerant. Poor grounding, frayed wiring, bad clutch coil, and defective AC pressure sensor switch can also be an issue although less common.

Can you bypass AC compressor?

The compressor cannot be bypassed without the use of a compressor bypass pulley. It would cost more for a bypass for the compressor than it would be to just replace the compressor pulley. Install a new pulley or pulley bearing if it can come off of the compressor and then put on a new belt.

How do I test my car AC compressor?

Turn on the AC. Connect a pressure gauge to the low side of the AC compressor, typically found on the firewall passenger side in the engine compartment. Add approximately 2 oz. of Freon to determine whether the compressor kicks on (if it does, you will hear a loud click followed by a puttering sound).

What module turns the compressor clutch on?

An AC clutch cycling switch is used to determine low side A/C pressure (which is directly proportional to temperature). This information is then used by the electronic control module (ECM) to control the compressor clutch.

What controls the AC clutch?

An air conditioning compressor clutch gets its power from the flywheel of your car’s engine. It is controlled using a clutch system where its shaft is engaged and disengaged to a rotating shaft of the flywheel using an electromagnetic switch.

How do I know if my AC compressor fuse is bad?

If you suspect that your AC may have blown a fuse, the first thing you shall notice is that the outside unit of your AC is not doing anything. You may hear a minor humming sound, but that is the extent of it. The humming sound is produced because, despite no power, the furnace keeps asking the AC to run.

AC compressor clutch won’t engage – Toyota

A malfunctioning flow control sensor is frequently to blame when the AC compressor clutch on a late-model Toyota won’t engage and you discover a B1479 Flow Control Circuit issue code saved in your vehicle’s computer. The quantity of refrigerant flowing through the compressor is detected by the AC flow control sensor, which is used by Toyota. The ECM can make adjustments to idle speeds and engine load characteristics based on the reading in order to save gas. Input from the AC flow sensor is converted to voltage and then delivered to the AC amplifier, which interacts with the ECM through digital communication.

Disconnect the electrical connector from the sensor and check for a voltage of 5 volts to rule out the possibility of an open to the sensor.

This is followed by a measurement of the change in voltage to estimate the flow rate.

It must be greater than 0.3V and less than 4.7V, and it must be variable.

How to fix a B1479 and AC compressor clutch won’t engage

Unfortunately, Toyota does not appear to offer simply the sensor and instead suggests that the complete compressor be replaced. However, the sensor is available for purchase from various Chinese vendors (such as Alibaba). You should keep in mind that you will need to discharge the refrigerant in order to replace the sensor. After that, you’ll have to vacuum and recharge your batteries. Rick Muscoplat’s 2016 Rick Muscoplat’s Rick Muscoplat posted a blog entry on

A/C does not work, clutch won’t engage

First and foremost, you must determine whether or not there is any R12 freon in the system. The location of the Schraeder valve with the red cap has previously been established; now locate the Schraeder valve with the black cap and unscrew it. Slightly compress the valve with the tip of a pen, pencil, or toothpick to observe if any freon hisses out of the system. If this is the case, it is a good indication that the system has a partial charge of R12 and only need additional R12 to get the compressor running again (assuming compressor is not seized).

Make certain you get GENUINE R12, which looks like this: vxp=mtr hash=item3a6fac3650 vxp=mtr hash=item3a6fac3650 Get a can tap valve and a charging hose kit as well: vxp=mtr hash=item256306088a vxp=mtr hash=item256306088a Connect the can tap valve to the can using a hose clamp (wear goggles in case of an accident that causes freon to spurt -20 degrees F refrigerant into your eyes).

Maintain submersion of the can in 110 degree Fahrenheit water to drive gaseous freon into the system.

Now that the system has more freon in it, start the engine and press the AC button to see if the compressor will now run and deliver cooling.

If this is the case,

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 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.

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.

Source:

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.

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.
See also:  Nissan air conditioning isn't cold?

What to look for during your visual inspection

In order to test the clutch, you may either purchase a power probe or use a wire similar to that shown in the video. Before purchasing anything, check the AC compressor while the engine is running, as stated later. Also, check to verify if the AC clutch engages when power is applied to the compressor. 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; Examine the clutch plate for signs of corrosion – Rustcould be an indication that the compressor is old and may just require replacement since it has worn down and gotten damaged.

  • The wiring to the clutch should be checked since if the wires aren’t correctly connected, it might have an effect on how well the compressor works To deliver enough electricity, the wires must be properly connected and in excellent shape.
  • In some vehicles, the low-pressure switch causes the compressor clutch relay to cycle on and off.
  • To diagnose the problem more quickly, thoroughly analyze all of the system’s components.
  • Examine the fuse if you are unable to obtain a voltage measurement.
  • The clutch relay should be checked if everything is working properly with the fuse.
  • Make a visual inspection of your air conditioning system for leaks – check for leaks coming from the condenser, receiver, or any other points where metal pipe connections are formed;

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.

3.

Here’s a video that demonstrates how to locate an air conditioning leak using a fluorescent dye: How to Find an AC Leak.

Image courtesy of: You may also experiment with a refrigerant leak detector before purchasing a can of halt leak.

Check to see if it is compatible with the refrigerant you are using. This is an example of a refrigerant leak detector. Here’s a refrigerant leak stopper and refill kit to get you started.

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.

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.

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.

When removing one and replacing it with a new one, the work is time-consuming.

Furthermore, purchasing a new compressor is not significantly more expensive than having an old one fixed.

If you’re interested in installing your own compressor, you should watch this video (How to Replace an AC Compressor in Your Car) first. Here’s another video that will provide you with additional information to assist you along the journey. (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.
  • If a fuse blows, it is a simple matter to replace it.

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.

Read more articles from our blog for additional information about automotive engines, automobile parts, and the difficulties that might arise with automobiles.

AC Compressor Won’t Engage

AWESOME. You were smart to inquire rather than simply drinking the dealership’s Kool-Aid. The fact is that a dealership is motivated to conduct the repair as quickly as possible. They can’t afford to waste time tracking down a minor offender and just replacing him. These individuals are well aware that certain components will wear out over time and will need to be replaced. Because ‘they’ (the dealership) did not fit it correctly the first time, their strategy is to not have the customer come back in a few months insisting that they did not address the issue initially and insisting that the dealership get it fixed because ‘they’ (the dealership) did not fit it correctly the first time.

  1. When I’m looking at a repair, I do the exact same thing.
  2. Things like serpentine belts, hoses, and ‘O’ rings are examples of items that I know I’ll be pursuing in the near future.
  3. However, if you are paying a business a lot of money to install a new serpentine belt that you will have to remove in order to repair, say, an alternator, it may get expensive.
  4. Chap

Toyota-4Runner.org

Member Join Date: Mar 2010Location: Southern OregonAge: 47Posts: 84
Member A/C compressor won’t engage

Lesson learned.even if it’s a cold day outside when you’re test driving a vehicle.make sure the A/C works! Anyway.Fired up the A/C for the first time the other day only to receive warm air. A/C light is on steady with no flashing. Clutch isn’t engaging on the compressor. Is there a low-pressure switch that won’t allow it to engage if there’s no refrigerant? Which of course I can’t check because the compressor won’t turn on. What are the proper steps for troubleshooting this? Any help is much appreciated!
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Senior Member Join Date: Jun 2007Location: SoCalPosts: 1,415
Senior Member Quote:Originally Posted byarracadoLesson learned.even if it’s a cold day outside when you’re test driving a vehicle.make sure the A/C works! Anyway.Fired up the A/C for the first time the other day only to receive warm air. A/C light is on steady with no flashing. Clutch isn’t engaging on the compressor. Is there a low-pressure switch that won’t allow it to engage if there’s no refrigerant? Which of course I can’t check because the compressor won’t turn on. What are the proper steps for troubleshooting this? Any help is much appreciated!Check the 10 amp gauge fuse and the heater relay._Larry ‘Monsters From the Id’ 2004 SR5 V6 Titanium Metallic/Stone, Auto Dimming Compass Mirror, Valor Tip, Overhead Console W/HomeLink, Cargo Net, Michelin Cross Terrains, Added JBL Synthesis 10 speaker system 6/08, USA Spec PA-15 TOY Ipod Interface, Drivers Side Overhead Handle, Valvoline Synpower 5W-30, Mobil 1 75W-90, LEDs
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Member Join Date: Mar 2010Location: Southern OregonAge: 47Posts: 84
Member Both check out. Check for coolant next I guess, if none, look for leaks and recharge. Hopefully that’s what it is and not a bad compressor._’99 SR5 4×4, 3.4L V6 Automatic
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Senior Member Join Date: Jun 2007Location: SoCalPosts: 1,415
Senior Member Quote:Originally Posted byarracadoBoth check out. Check for coolant next I guess, if none, look for leaks and recharge. Hopefully that’s what it is and not a bad compressor.The system has a dual pressure switch for protection so I guess adding refrigerant would be the next step._Larry ‘Monsters From the Id’ 2004 SR5 V6 Titanium Metallic/Stone, Auto Dimming Compass Mirror, Valor Tip, Overhead Console W/HomeLink, Cargo Net, Michelin Cross Terrains, Added JBL Synthesis 10 speaker system 6/08, USA Spec PA-15 TOY Ipod Interface, Drivers Side Overhead Handle, Valvoline Synpower 5W-30, Mobil 1 75W-90, LEDs
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Moderator Join Date: Jun 2004Location: the Socialist State of MarylandPosts: 10,851
Moderator Connect 12V directly to the connector on the compressor. That will tell you if the comp and clutch work._- the Internet – the mother-ship of people who don’t know much and aren’t afraid to go publicFOUR WHEELER mag July 20xx and OFF-ROAD mag Feb 20xx’84 4Runner – ARBed 5.29s F R, 4.72.28 t-cases, 2′ drive train lift, BudBuilt x-member/skid, 30 spl Longs’83 Toy P/U – Buick 231 V6, Holley 4 bbl, Weiand intake, Downey headers, TH350 w/700R4 low gearset, ’89 4Runner SR5 – stock
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Member Join Date: Mar 2010Location: Southern OregonAge: 47Posts: 84
Member Thanks for the help guys. When I said ‘coolant’ I meant refrigerant, but you probably already knew that_’99 SR5 4×4, 3.4L V6 Automatic
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Member Join Date: Mar 2010Location: Southern OregonAge: 47Posts: 84
Member OK, so my friend and I recharged the system and it popped right on, nice cold A/C as you’d expect. That was a few weeks ago. Today it warmed up and I turned it on and once again got hot air. Clearly there’s a leak somewhere.any input on how to troubleshoot this? I read that there are dyes you can put into the system to find the leak.do they work? Or should I just take it to a shop? Thanks in advance._’99 SR5 4×4, 3.4L V6 Automatic
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Member Join Date: Sep 2009Location: Gulfport, MsPosts: 741
Member Quote:Originally Posted byarracadoOK, so my friend and I recharged the system and it popped right on, nice cold A/C as you’d expect. That was a few weeks ago. Today it warmed up and I turned it on and once again got hot air. Clearly there’s a leak somewhere.any input on how to troubleshoot this? I read that there are dyes you can put into the system to find the leak.do they work? Or should I just take it to a shop? Thanks in advance.leak detection kit. Comes with dye, light, and glasses.Maybe easier for you to take it to a shop!_1994 6766 Supra SOLD 2001 SR5 Sport 4WD, AR JR intake, Tundra 5100s, TRD springs, 890s, LC shocks 2005 GX470 2008 USB ISF ARMY AVIATION
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Member Join Date: Mar 2010Location: Southern OregonAge: 47Posts: 84
Member Yeah I’m thinking a shop might be the way to go. How often will I need an A/C leak detection kit, you know? Should just save the money and put it toward the repair.Do leaks tend to be expensive repairs? I’m guessing it depends where the leak is._’99 SR5 4×4, 3.4L V6 Automatic
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Member Join Date: Mar 2010Location: Southern OregonAge: 47Posts: 84
Member Figured I’d first try the Toyota dealership I bought it from. No warranty but it’s worth a shot to see if they’ll check it out for me._’99 SR5 4×4, 3.4L V6 Automatic
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Member Join Date: Sep 2009Location: Gulfport, MsPosts: 741
Member Quote:Originally Posted byarracadoYeah I’m thinking a shop might be the way to go. How often will I need an A/C leak detection kit, you know? Should just save the money and put it toward the repair.Do leaks tend to be expensive repairs? I’m guessing it depends where the leak is.Just depends where it is in the system. Sometimes it’s just an Oring which is a cheap fix. Other times it could be a hose, condensor, evaporator, etc which can get expensive.Hopefully its just an oring or hose for ya. Could even possibly be a leaky valve core which is also a cheap fix.You’ll only need it once in this paticular case.But if you loose air agian in the future on this car or another its always handy to have with you. I have a shitload of a/c tools I’ve barely used but in the end it pays for itself._1994 6766 Supra SOLD 2001 SR5 Sport 4WD, AR JR intake, Tundra 5100s, TRD springs, 890s, LC shocks 2005 GX470 2008 USB ISF ARMY AVIATION
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Member Join Date: Mar 2010Location: Southern OregonAge: 47Posts: 84
Member Since we only used one can of refrigerant when we recharged it, I’m thinking that maybe I just didn’t get enough in there. Gonna pressure test it and add another can if it needs it. The compressor does engage so there’s enough in there for that._’99 SR5 4×4, 3.4L V6 Automatic
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Member Join Date: Mar 2010Location: Southern OregonAge: 47Posts: 84
Member Guys what is the eye in the evaporator supposed to look like when the system is charged? We added another can and I put some dye in there to find the leak. It’s still blowing cold after a couple of days, and I can’t see any leak yet under a blacklight. The eye in the evaporator looks as if there is milky white liquid passing through it quickly.is that what it’s supposed to look like when charged?_’99 SR5 4×4, 3.4L V6 Automatic
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Member Join Date: Mar 2010Location: Southern OregonAge: 47Posts: 84
Member Well after a summer of having this ‘fixed’ only to have it start blowing warm after a while, the shop says it should be good to go. They replaced the condenser, all the o-rings, and finally found the final leak on the evaporator in the cabin. They’ve charged and evac’d it a number of times, but he says he can only get it down to 50� output. Is that acceptable? I’m going to pick it up shortly._’99 SR5 4×4, 3.4L V6 Automatic
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Member Join Date: Sep 2012Location: se usaPosts: 100Real Name: thanks
Member NO, You will NOT BE HAPPY if it is not in spec. Warm air sucks. Barely cool is worse!Replace the compressordryer, flush all components separatly and new oilrefridgerantto exact quantity spec.Then Nitrogen finish.Yeah, a few more bucks but worth it!
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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 flywheel of your car’s engine provides the necessary power for an air conditioning compressor clutch. Using an electromagnetic switch, it is controlled by a clutch system in which the shaft of the flywheel is engaged and disengaged from a revolving shaft of the flywheel. In your car’s air conditioning system, the compressor and the clutch are two of the most important components. These components, as well as other automobile components, should be regularly maintained to guarantee that they are always in proper working order.

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?

Excess refrigerant; insufficient refrigerant; insufficient oil in the compressor Using the clutch sensor’s lockout as a default: A/C compressor clutches are found in the majority of current automobiles. These clutches are controlled by the high and low pressure switches, as well as by the amount of compressor oil measured 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 run out of refrigerant.

  • To determine whether or not the fuse has burned out, turn off the car’s engine and remove the fuse from the circuit.
  • If the fuse does not appear to have blown, it should be returned to its original location.
  • A red line in the display glass indicates that there is sufficient oil.
  • It is essential that you choose an oil type that is appropriate with your specific compressor model.
  • The user’s manual contains detailed information on the specs.
  • Consult your system’s handbook to find the proper operating pressure on the high-pressure side of your air conditioning system.

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.

Conclusion

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, which should read a lower pressure than is required. If you’re not sure what degree of pressure to use, consult your car’s air conditioning handbook. Recharging your refrigerant is possible with the use of repair kits, which come with detailed instructions on how to recharge your coolant. 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, which should read a lower pressure than what is required.

Charge your refrigerant with a repair kit, which comes with instructions on how to replenish the coolant.

AC Compressor Not Working

The air conditioning compressor is disengaged and reengaged using an electro-magnetic clutch, which is used by the vast majority of automobile manufacturers. As previously stated, a magnetic field is used to draw the clutch in closer to the pulley. The clutch disc will next be splined to the compressor shaft, and the process will repeat. When this occurs, the pulley also serves as a source of spinning power for the compressor, which allows it to perform properly. Upon effective engagement of the clutch, the compressor for the air conditioning system will begin to pump refrigerant.

Try cranking the A/C settings all the way up to MAX A/C and then starting the engine.

If you look closely, you should be able to see both the clutch and the pulley rotating.

It is possible that you will just observe the pulley rotating, which means that there is an issue elsewhere in the system.

What’s Preventing the A/C Compressor from Engaging?

It is possible that a low pressure lockout, a faulty ground, a damaged clutch coil, an opening in the wire to the clutch coil, or simply a blown fuse are the causes of the compressor not engaging. There are a variety of methods through which A/C compressor clutches acquire electricity. One advantage is that the PCM can control the relay (the PCM interprets the condition of the low and high pressure sensors). Another method is to have a relay activate the clutches, which is powered directly by the low/high pressure switches when they are in a given state.

Let’s pretend that the fuse is in fine working order.

Before examining the power and ground, make sure it is not in close proximity to any moving components.

It is possible to check the voltage of the battery if you have a digital voltmeter.

It is possible that some automobile manufacturers will trigger relay control coil ground through the ECM or PCM. For the computer to deliver ground, a good signal from the evaporator temperature sensor, high pressure switch, and low pressure switch must be received.

Can You Charge a ‘Dead’ Compressor?

For example, a low pressure lockout, a faulty ground, a defective clutch coil, an opening in the wire leading up to the clutch coil, or simply a blown fuse are all possible reasons why compressors do not operate correctly. Compressor clutches for air conditioning systems can be powered in a number of different ways. For starters, the PCM can control the relay (the PCM interprets the condition of the low and high pressure sensors). Another method is to have a relay activate the clutches, which is powered directly by the low/high pressure switches when they are in a given situation.

  • Assume that the fuse is in good working order.
  • Before examining the power and ground, make sure it has been relocated away from any moving parts.
  • A digital voltmeter may be used to determine the voltage of a battery.
  • Some automobile manufacturers use the ECM or PCM to activate the relay control coil ground.

Help! A/C compressor clutch not engaging

Date of joining:June 4, 2009 Member:18031 Messages:279 Gender:Male San Juan, Puerto Rico Automobile:Sand Pearl Black 06 6spd DC SB TRD OR Modified The A/C was running properly last night, but this morning it would not engage the compressor clutch; the 10amp fuse was OK, but it was replaced nevertheless with no success. Because the compressor is not engaged and the air is not cold, the problem must be electrical; however, all of the control lights are in good working order; there are no blinking lights or anything abnormal; the blower is fine at all speeds; the only air being blown is ambient temperature; do you have any suggestions on where to begin?

If anyone can point me in the right direction or provide a copy of the schematic, that would be highly appreciated.

It appears that the signal to engage the clutch is not getting through to the compressor.

Sandman614Snarky TWSS elf, Travishotsavannahdotcom, LRGRNR⛄ Official TWSS Elf ❄️

Date of joining: October 26, 2010 Member:45273 Messages:34,839 Gender:Male First Name: TimGarner, North Carolina/Boone, North Carolina 2006 SR5 Off RoadARB Front Bumper, Projector Headlights w/Slimcubby 4300K HID’s, Oznium LED’s, LED taillights, DIY Washable Cabin Moose Filter, Sockmonkey SR5 Off Road, Aux Audio plug, OME 886x, OME Nitrochargers, Wheelers 3 Leaf Progressive AAL, Dodge D-Rings, ImMrYo Rear-View Mirror Lift Bra If your free-on is too low, the clutch will not engage automatically.

If the wiring appears to be in good condition, I would proceed to the next step. Those charge-it-yourself kits are available at the local parts stores.

NirvanaTesla Auto

Date of joining: January 2, 2010 Member:28653 Messages:1,248 Gender:Male Kris Morgan Hill, a native of the United States, goes by her first name. AVehicle:2006 Off-Road 4X4Icon ext. travel 2.5RR in front, Icon ext. travel 2.0RR in rear, Icon ext. travel 2.5RR in between UCAs from BuiltRight, Wheelers Superbumps, Goodridge steel braided brake lines, BruteForce front plate bumper with Warn M9000+synth line, American Auto Horns ACDF, Pelfrey Bussman mount+Sandman bussman fuse block (soon), 255/75R16 tires on painted stockers, and more.

Sound deadener and improvement from Shok Industries’ 2/0 large four.

It’s possible that the problem is electrical, however I have seen more compressors ‘stop operating’ due to a lack of charge than any other problem.

Mandy3206Well-Known Member

Date of joining:June 4, 2009 Member:18031 Messages:279 Gender:Male San Juan, Puerto Rico Automobile:Sand Pearl Black 06 6spd DC SB TRD OR Modified First and foremost, obtain the dials and check for pressure, which we will do right away and see how things go from there. Any more information would be much appreciated.

ailll1Well-Known Member

Date of joining: November 3, 2011 Member:66387 Messages:145 Gender:Male Alex is his given name. Canada’s province of Québec Vehicle:2016 TRD Sport Double Cab Toyota Tacoma Trd Sport Just a random thought: Make an attempt to jump the freon sensor in order to trick the vehicle into thinking the freon tank is full. Check to see if it responds then. However, do not leave it running for an extended period of time. Someone might be able to provide some insight into where to look for this sensor.

Got2rydeWell-Known Member

Date of joining: May 1, 2012 Member:77982 Messages:609 Gender:Male Ryder Maryland is my given name. Automobile: ac or a six-speed silver streak ATO rear with flush mount duallys, FJ Trail Team black rims with Duratracs, GTCovers wetskinz seat covers, Direct wired Escort 9500xi, Leer 180 with ARB awning, bed mat, extra d-rings, rear differential breather relocated, Weathertec mats, Elite front with Warn M8000-s and Rigid D2’s, BAMF sliders, ABS killswitch, Kicker Hideout sub, I took a spin in my first-generation Toyota Tundra.

  1. Two nearby garages and one toy store all agreed that I needed a new compressor.
  2. I tried replacing the compressor myself, but to no avail.
  3. I was very frustrated!
  4. Separately, I have a perfectly fine air conditioning compressor off of a 4.0L Toyota Tundra for sale at a low price!

TacorriendoWell-Known Member

Date of joining:June 23, 2013 Member:106885 Messages:263 Gender:Male FredTexas is his given name.

Vehicle:2009 DCSB 4×4 Off-Road Vehicle Description Front lift, ride rite airbags, side steps, and a switch for the back camera are all included. Manually engaging the clutch is also an option. purely for the purpose of troubleshooting

blakes09Toyota Tech.when im not Fishing

Date of joining: April 18, 2012 Member:77164 Messages:818 Gender:Male Blake’s first and last nameDeep South Is the compressor receiving power and ground from the 4×4 vehicle?

Mandy3206Well-Known Member

18th of April, 2012 (joined) Member:77164 Messages:818 Gender:Male BlaineDeep South is his first name. Does the compressor receive power and ground from the vehicle’s four-wheel drive?

savedoneWell-Known Member

Date of joining: May 17, 2013 Member:104359 Messages:1,064 Gender:Male GeraldTexas is his given name. Vehicle: TRD off-road manual transmission The dealer installed a 3 inch raise at the time of purchase. I’m assuming he charged you somewhere in the neighborhood of a hundred bucks for checking out the system. That is the standard rate in my neighborhood. If you’re going to obtain another diagnostic, I’d recommend going via the dealer. After that, you may purchase all of the necessary parts, including oil and Freon, and have your neighbor install them.

Mandy3206Well-Known Member

Date of joining:June 4, 2009 Member:18031 Messages:279 San Juan, Puerto Rico (Male) Automobile:Sand Pearl Black 06 6spd DC SB TRD OR Modified Thanks, I’ll check with the dealer as well and see what they have to say. There was no price for the quotation, and I believe the cost of the quotation was included in the labor portion.

85GT 79FJ40Well-Known Member

Date of joining: December 16, 2010 Member:47768 Messages:999 Gender:Male Ken’s given name is New Hampshire. The vehicle is a 2011 4Runner Trail. There’s a lot of cool things and 285’s roaming about. It was a bizarre thing that happened to the evaporator. Usually, if anything is going to fail, it is the condenser, which is caused by road debris. In 2004, I purchased a brand new RSX, which was damaged by a rock on the third day of ownership. The evaporator, on the other hand, is located under the dashboard and is more difficult to replace than the condenser.

Prior to purchasing my own system, I used to complete all of the work and then transport the car to a location that provided free A/C inspections.

92dlxmandrinking whats on sale

Date of joining: June 24, 2012 Member:81250 Messages:1,447 Gender:Male Kevin is my first name and I live in Visalia, California. Using the vehicle:08 access 4×4 4.0 6-gear5100s, ome884s, wheelers aal kit, and rustoleumi are some of the parts used. My understanding was that any malfunction the system detected and immediately shut down would result in a flashing air conditioning light on the dash. When you press the button, it responds with ‘na,’ meaning ‘I don’t want to run,’ and a blinking light indicates that it is shutting down.

It’s difficult for me to fathom why there is a leak in the evaporator.

Also, use caution while dealing with your neighbor.

ensure he has a vacuum pump, a r134 manifold, and nitrogen on hand if possible ‘No thanks,’ you should tell him firmly if he intends to fix your system without those three items at the very least.

Mandy3206Well-Known Member

Date of joining:June 4, 2009 Member:18031 Messages:279 Gender:Male San Juan, Puerto Rico Automobile:Sand Pearl Black 06 6spd DC SB TRD OR Modified My neighbor has all of the equipment necessary to complete the job and has experience working with mini-split systems; however, he does not work on automobiles; however, if I rip the dash apart and gather all of the parts, he will complete the job for me; however, I must be certain that the evaporator is the problem, which will be determined by the diagnostics that will be performed next week.

Was debating trying charging it myself with apep boyskit of gas and oil without the sealants, just to see whether the gas leaves rapidly or if it stays in for a long period of time, and was wondering what everyone’s thoughts were.

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