I have a work around in mind. Seems to me right after I rebuilt the entire AC system, I had rapid clutch cycling. Manually Interact with the AC Compressor. I have replaced; compressor, dryer, expansion valve. You will not be able to switch off the AC. I have a spare stock Nissan one and I am going to try that next. The last thing you want to deal with is a hot car cabin. Types Of A/C Systems in a Car Causes Of A/C Clutch Engaging and Disengaging Intermittently 1. However, fixing a timing belt is not an easy task and requires skills and knowledge of the mechanical part of the vehicle. Lastly. Keep in mind that the air conditioning compressor does not always engage. This ensures that it only runs when required. I have spent hours and hours pouring over wiring diagrams trying to find out where this thing is getting a ground to close the AC relay. Most modern cars feature AC clutches that use low and high-pressure switches and compressor oil levels to turn on and off. While in modern vehicles with PCM (Powertrain Control Module), transducers are used. This locks the pulley and the drive plate together. The AC clutch should not be engaged meaning you should see that the outer pulley driven by the belt is turning, but the inner hub should not. If the pressure of the refrigerant is lower than a certain level, the system wont carry enough refrigerant oil to the compressor, causing it to fail. The vehicles engine is directly connected to the compressors pump mot through a belt to operate this compressor clutch properly. Pressure is not cycling 35 low 150 and up on high. So it was then I bought a new pressure switch and that was when I discovered I could never shut the silly thing off. The role of the compressor clutch is to convert energy from the engine and supply it to the compressor. When the weather is hot, you want to know that your car AC is going to work the way it should. As I have explained above, an AC compressor clutch that engages and. Once pressure is built up inside the piston, a hydraulic thrust bearing pushes against a crankshaft, forcing it forward. Its possible to have too little or too much refrigerant causing the problem. Answer: You need to replace the AC pressure switch if any of the following happens: www.startribune.com, mechanicbase.com, www.automotiveguider.com, itstillruns.com, www.yourmechanic.com, Copyright 2023 YourGreatCar.com | Powered by Astra WordPress Theme. PCM receives these electric signals and commands the system to engage or disengage the A/C clutch. It's located next to an electromagnetic coil. If the AC finishes the cooling process after a couple of minutes, then the thermostat is not the problem. If I disconnect the pressure switch on dryer clutch stops. This process engages the plate, along with the compressor belt. Not a whole lot was resolved. The clutch resembles a friction plate. :-/. It could also be caused by a leak in the compressor or damage to the wiring. If the clutch is seized, the normal action of the compressor will not be able to continue. It does not vary the amount of refrigerant flowing into the evaporator the way an expansion valve can. An AC compressor clutch relay can switch power in a number of ways. Bad CV Joint Symptoms and Replacement Cost, Bad Hydraulic Lifter Symptoms and How to test a hydraulic lifter, Bad input shaft bearing symptoms and replacement cost, How to Remove Stripped Nuts in Your Car (Easy Guide), Foot brake vs Handbrake, The key differences between these brakes, How to open a car door that wont open; practical tips for a car door that is stuck, Troubleshooting PT Cruiser Transmission Problems (Explained & Solved), Resonator vs Muffler (Practical Comparison Guide), How to correctly shim a starter for your car (step-by-step instructions), P1259 Code, VTEC system malfunction, How to Fix the Error Code, P1886 Code, Shift Timing Solenoid Performance, Troubleshooting, and Diagnostic Help. My air is nice and cold, has the right amount of PAG and refrigerant, but when the car starts, I can hear the clutch engaging with the system turned off. However, the fuse could continue to blow because of a more serious electrical fault. If the car ac clutch is still engaged, it means it is seized. This situation means that the refrigerant inside your car keeps on freezing, and it will be solved if you replace or fix the compressor switch. The high-pressure switch is present after the A/C compressor. If the air gap is greater than 1.0mm, you need to change the clutch assembly. Answer: Yes, the compressor pulley should keep running at all times. People often think that the car should be on when youre bleeding the brakes, but this isnt always the case. Because it sounds like what you'd expect from one that isn't engaged. Worst part is, I just bought new tires for my carI know AC repairs can get costly, so if I had known I'd be spending money on AC repairs, I may have said goodbye to my (other than AC) trusty car. Therefore, lets explore more about a disengaging and engaging compressor clutch and see what we can do to curb the situation. I would think that unplugging it would break the circuit. In normal conditions, the A/C compressor cycles after every 15 to 20 minutes or three times per hour. 663K subscribers 934K views 7 years ago In this video, I show you how to tell if a car's AC compressor clutch is engaging. If their capacity of holding the moisture is full, it will also affect the pressure on the low and high-pressure lines of the AC system. Once the compressor is overcharged, the unit will read abnormal high pressure. When the AC is turned on, the clutch gets electrical energy. Because if you have a faulty AC compressor in your car, you will not be comfortable as it can get a low temperature inside the car. Why Can't Helicopters Fly At High Altitude? We and our partners use data for Personalised ads and content, ad and content measurement, audience insights and product development. If it is not moving, it could be a sign that the clutch is bad. I would check the compressor clutch wire at the compressor for power now. Its purpose is to detect any blockages in the system that would lead to more pressure. Is it possible that the relay is stuck closed? Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network. In somevehicles, the evaporator temperature sensor turns on and off the clutch relay. (The Full List). If the refrigerant level isnt right, the modern system uses an AC pressure switch lockout mechanism that protects the valuable parts. About Us - Car Overheating Then Going Back To Normal 7 Reasons, Single Pop Noise When Braking: What Causes It and How to Fix it, Clunking Noise When Braking : 5 Causes And Solutions, How To Clean Purge Solenoid Valve? 3. if(typeof ez_ad_units != 'undefined'){ez_ad_units.push([[250,250],'yourgreatcar_com-banner-1','ezslot_7',627,'0','0'])};__ez_fad_position('div-gpt-ad-yourgreatcar_com-banner-1-0');Also read: Where is Toyota Manufactured? If it is, you have to replace the clutch assembly. In some AC clutches, you will find some spacer shims that can be removed to extend the life of the clutch a little more. In addition, the compressor clutch stops the AC from running 24/7.If it ran all the time, there would be a noticeable reduction in fuel economy; not to mention more chances of . (The Full List). AC compressor is not turning on. If the clutch doesn't engage, the problem could be a blown fuse, an open in the wire to the clutch coil, a bad clutch coil, a poor ground, a low pressure switch lockout, or even a bad engine coolant temperature switch. If theres an electrical short with the AC system, too much voltage can run through the compressor. To check the wiring, you will need to access it from under the hood. Do Not Sell or Share My Personal Information. if(typeof ez_ad_units != 'undefined'){ez_ad_units.push([[250,250],'yourgreatcar_com-leader-1','ezslot_5',176,'0','0'])};__ez_fad_position('div-gpt-ad-yourgreatcar_com-leader-1-0');Your cabin temperature will begin to rise unexpectedly. So, when engaging the compressor clutch, a current moves via an electromagnetic wave. Very weird! If your engine still turns off after several minutes, then youll need to move on to the next step. This typically also indicates that the thermal protector in the a/c compressor is okay as well because the computer is still turning it on. Check if the compressor's clutch has been engaged. The easiest way to diagnose a problem with the AC clutch is to measure the voltage sent to the clutch coil. Diagnose the problem first before swapping out a thermostat or wiring harness. Check that the radiator cooling fan engages when the A/C button is pressed. Power into the relay pull-in comes from pin 12 (red wire) and out of pull-in, pin 22 (pnk/yel) to pcm ground. This means that the AC clutch will engage and disengage if the refrigerant pressure in the system is low and re-engages as the pressure between the high and low-pressure sides equalizes. An Air Conditioner compressor clutch that engages and disengages repeatedly is a typical indicator that the system of your vehicle is flawed on refrigerant. One of the major reasons for a constantly engaged compressor clutch is that it is seized. I checked under the hood to see if the compressor clutch was spinning and it was. Common Causes (& How to Fix). 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Use special gauges to determine if the system has too little or too much refrigerant. If this doesnt start the clutch, the clutch needs to be replaced. Ken, I removed the signal wire running from the relay back to the ECU. The clutch then actuates a small pump that pressurizes oil inside a piston. 150,000 MILES A/C clutch engaged all the time. Similarly, too high pressure of the refrigerant at the inlet of the evaporator gives poor heat transfer at the evaporator. Itll also spin when the pulley and compressor are engaged. The pulley should still spin with the AC disengaged. The air gap between the friction plate of the clutch and pulley is determined by the automobile company and is related to the strength of the AC clutch coil. Besides, an AC has sensors for determining refrigerants temperature and pressure, stopping and starting the compressor through engaging and disengaging the compressor clutch. if(typeof ez_ad_units != 'undefined'){ez_ad_units.push([[300,250],'yourgreatcar_com-large-mobile-banner-1','ezslot_6',613,'0','0'])};__ez_fad_position('div-gpt-ad-yourgreatcar_com-large-mobile-banner-1-0');Let us know if you have any queries or comments related to this article. The most common reason could be that the coolant level is low and the compressor is engaging and disengaging intermittently to maintain the seals in the system. You must activate the AC Compressor Clutch of your vehicle whenever you want to use it. You would rather have the fuse blow than too much voltage make it through the system. AC compressor is responsible for cooling down the air as it compresses the refrigerant fluid, which is usually freon. If the a/c clutch stays engaged, there is a possibility that it may be seized. Save my name, email, and website in this browser for the next time I comment. Either way, the clutch could fail to disengage. Do Not Sell or Share My Personal Information -. Can you test the AC switch to make sure the signal is being cut when the switch is off? Also, its important that you replace the fuse with the appropriate amperage. Follow the following guide to work on the situation: You can quickly diagnose this issue since the display glass is visible to spot the oil level. The pump then returns to its at-rest position, and the circuit starts again. Installing a manual over-ride switch on your A/C system will allow you to disengage the A/C without turning off your car. If there wasn't enough in the system, it wouldn't even do that. Thats why it is important to tell if the AC compressor clutch is bad. The clutch and the compressor are the Air Conditioner systems essential parts of your vehicle. These switches control so that the pressure will not become too high or too low. What Happens if the Compressor Clutch Does Not Disengage? RELATED: 5 Signs of a Bad AC Compressor Clutch (& Replacement Cost). The vehicles engine is directly connected to the compressors pump mot through a belt to operate this compressor clutch properly. This will lead to further issues with the AC. It could also slip at times, leading to erratic operations. Its advisable to confirm from your user manual to configure the required operating pressure at the higher pressure side. Its controlled and monitored by a clutch system through engaging and disengaging to a cycling shaft with the help of an electromagnetic switch. This blog is about my passion for vehicles, and I hope you can pick up some helpful tips along the way! Short cycling is one of the significant problems with AC conditioning that occurs mainly when the compressor clutch comes on and then goes off constantly. I have replaced expansion valve, dryer, Freon. If there is a short circuit, you will not see any conductance. I then tried pulling the compressor clutch relay thinking this would definitely disengage the clutch, and it didn'tThe clutch seems to spin without the relay, and without any selections on the heating control unit. Thanks for the advice! If youre driving on a cool day with the fan at low speed, the compressor may only come on for a few seconds at a time. Yes sir, clutch stays on. This is because the compressor clutch is always engaged and so the compressor stays activated. Ignition Coil vs Spark Plug: What Are The Differences Between Them? Ive had that freeze over issue in the past with this car. Okay, do you mean if you have less than 20 lbs of pressure on the low side, the compressor is still engaged? When the low-pressure switch is bad, it will not be able to measure pressure. Leaks could be at the lines on the comp, service valve stems, seals at the dryer or condensor. I will get one tomorrow and let you know the results. The function of an A/C accumulator is similar to the receiver/drier. Again, refer to your user manual to know the correct pressure level. Not necessarily but most AC clutches are designed to spin freely when disengaged. The wiring is responsible for sending the signal from the low-pressure switch to the compressor. Replacing the Air conditioning (A/C) Refrigerant Pressure Sensor. Your air conditioner clutch stays engaged even after the engine has been turned off, which is a common problem that can be a pain to fix. It also helps shut down the AC compressor. if(typeof ez_ad_units != 'undefined'){ez_ad_units.push([[300,250],'yourgreatcar_com-large-mobile-banner-2','ezslot_8',614,'0','0'])};__ez_fad_position('div-gpt-ad-yourgreatcar_com-large-mobile-banner-2-0');Answer: If the low-pressure switch circuit is open, it will send a signal to the controller which will in turn switch on the low-pressure alarm. With ac on, the large center clutch should turn with the belt. Draining the refrigerant is necessary once youve realized that the refrigerant overcharges the compressor. This causes the entire clutch assembly to be stationary which leads to the belt squealing, and slipping. At 35, the clutch will stay engaged. In this guide, we cover the different problems you might encounter. The cycling of the AC compressor depends on cabin temperature, ambient temperature, compressor design, or airflow across the evaporator coil. If the AC compressor clutch won't engage, the clutch is going to stop moving. Clutch plate damage can also happen if the air gap between the pulley and clutch plate widens beyond a certain point. I will remove that signal wire from the ECU from the relay tomorrow and report back my findings. When the AC is turned on, the clutch gets electrical energy. Another reason behind the auto ac compressor clutch staying engaged could be because the refrigerant levels are low. Is the air from your car intermittently transitioning from cold to lukewarm and humid when you are on a drive? Disclaimer: As an Amazon Associate, I earn from qualifying purchases. If it has blown, your only option is to replace it. I will do you one better Ken. Certified Automotive Diagnostic Technician. Pink wire grounding th relay. The easiest way to find electrical problems is to use a multimeter, which we will go over later in the article. Ac off, the clutch plate/compressor shaft doesn't turn. Yes, you can notice the water pump leaking even when the engine is off. If the AC compressor is not running, it will not compress the refrigerant. if it stays engaged after that the clutch has seized and not much you can do except replace it. If there is less than 12v at the AC compressor coil, it would also cause the AC clutch to disengage intermittently. I have shot all wires in this system to the ECU and I have nothing grounding out. Many things go into when to bleed brakes- one of the most important beings when the car should be on. If the system were where it is supposed to be, the compressor would kick on/off constantly once the system has been run for a little while. In the refrigerant, the lubricating oil for the compressor is mixed for the proper operation of the compressor. Its located next to an electromagnetic coil. In modern engines, pressure transducers are used instead of pressure switches. You can recharge the A/C system with a refrigerant that has a dye in it so you can trace all the hoses and connections when the system leaks down again. It can also be caused by a faulty high or low AC pressure switch, a blown fuse, a bad AC clutch or a bad electrical connection. Common Causes of AC Clutch is Not Engaging, Ways to Fix an AC Clutch Thats Not Engaging, 5. Other causes for this include faulty parts such as the thermostat, compressor, and heating element. Measure the voltage coming to the connector with a multimeter, and if everything is activated properly, you should see 12 to 14 volts coming to this wire. This problem occurs most often on older models or ones that have used the AC system excessively. MAF (Mass Air Flow) sensors are crucial to the efficient operation of the vehicles computer because they measure the amount of air entering the engine and transmit the information to the computer. These slots allow magnetic field lines from the coil to pass through and pull the friction plate in contact to complete the clutch engagement. 2. This happens due to compressor malfunctioning as it can no longer regulate refrigerant flow. Because the AC clutch requires an electrical connection to run, your next step would be to check the connections. If you think that your compressor clutch might be going bad, here are a few signs to look for: Cabin temperature is higher than normal: If you notice that the cabin temperature is not as cool as it used to be, it could be a sign that the compressor clutch is going bad. 2011 Failure of AC Compressor Clutch. Once the compressor is engaged, if the low side pressure is under 40 psi, it is verified that the AC system is undercharged. The refrigerant rotates through the machine many times, so checking such parts can be helpful. Finally got my service documentation back online after a server crash. You can jump-start the clutch to see if it will get moving manually. Coolant levels can also add a variable to this if you are low on coolant, ac clutch will disengage and re-engage of its own accord. Copyright 2023 Mechanic Base. between the compressor and evaporator might indicate that the system is overcharged with the refrigerant. Lets go! There are a couple of ways you can fix the problem to bring back the air conditioning system in order. You can also try replacing the AC refrigerant pressure sensor to solve this issue. Please confirm this so we can continue. Symptom 3: AC blows warm air There's only one reason for this: a slipping clutch. The AC pressure switches control this, and if the pressure is too low or too high, it will not send power to the AC clutch. The serpentine belt powers the AC compressor, water pump, power steering pump and other accessories. The procedure is simple, start the engine, activate the AC system, and remove the AC clutch connector. Archive - The AC compressor will only run when the electromagnetic clutch plate will engage with the pulley. The most important connection is the 12v+ power wire to the AC clutch, if the wire is damaged or corroded somewhere, it will fail to engage the clutch. If the clutch fails to disengage, the AC will remain on, when it shouldn't. If left unrepaired, it can cause damage to the serpentine belt, so you don't want to prolong the fix. Features and Gadgets - Why the criticism and hostility? Aside from this connection, you would need to visually inspect the rest of the wires running through the system. And I have no desire to figure it out either. Causes & How To Fix. Also, the AC clutch is controlled by the A/C button and not by the blower button. Rapid decompression and loss of refrigerant could conceivably result in condensation, as pressurized refrigerant cools as it expands from a liquid to a gaseous state. Wipers Going Wrong Way Why and How to Fix? I have explained that concept in this guide. I have had issues with the AC in this car in the past (replaced compressor clutch relay, compressor clutch, and heating control unit), but it had been working the last couple summers. It is recommended that you replace the compressor and the clutch as a unit. I thought you should know that an Air conditioner runs as an enclosed system. You should be able to reference a diagram in your cars service manual. There is a belt drive supplying energy continuously from the engine crankshaft pulley to the AC compressor. So, if the AC clutch engages intermittently and your cars compressor turns on and off rapidly, the most common cause is that the AC system is low on freon or it is having low pressure due to leaks or faults in the components of AC system. When it doesn't engage, you won't be able to get any cold air from the system. Unplug it and see if the clutch releases. There are many ways for AC compressor clutches to receive power. There are many reasons why an AC clutch does not engage. It appears I have a ground problem, that was the answer from the A/C shop. Save my name, email, and website in this browser for the next time I comment. Reddit and its partners use cookies and similar technologies to provide you with a better experience. Is the AC clutch supposed to spin all the time? The main factors are the outside and cabin temperatures, engine RPM, vehicle speed, AC system design, and how hot it is outside. A defective AC compressor clutch assembly can cause excessive noise or vibration when the air conditioning is on. On average, the compressor should stay on for 4-10 seconds and then off for 15-20 seconds. Both orifice and expansion valve cause pressure and a temperature drop of the refrigerant, but the expansion valve also controls the refrigerant flow as it has a spring that controls the opening of the valve. The metal parts rub against each other to make strong and loud noises. Too low pressure of refrigerant inside the system causes evaporator coils to freeze up, resulting in obstruction of airflow. The best way to replace the AC clutch is to take it to a professional mechanic and have them do it for you. 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