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ac compressor clutch always engaged

You may correctly do this with the help of a discharge valve located at the gauge.if(typeof ez_ad_units != 'undefined'){ez_ad_units.push([[300,250],'electrity_com-large-mobile-banner-1','ezslot_10',120,'0','0'])};__ez_fad_position('div-gpt-ad-electrity_com-large-mobile-banner-1-0'); Checking the coolant level of the compressor is necessary by inspecting the nature of the pressure gauge. That is a good one, I have the wiring diagrams here and I am looking over as well, you can confirm that when you remove the ground (pink wire) from the ECU the compressor turns off? Diagnose the problem first before swapping out a thermostat or wiring harness. It is recommended that you replace the compressor and the clutch as a unit. AC compressor is responsible for cooling down the air as it compresses the refrigerant fluid, which is usually freon. Besides, an AC has sensors for determining refrigerants temperature and pressure, stopping and starting the compressor through engaging and disengaging the compressor clutch. The AC compressor clutch is a device that allows the compressor to engage and disengage from the engine. The frequency of A/C clutch engagement depends on the type of car and the climate where it is driven. 150,000 MILES A/C clutch engaged all the time. Sure, he is not the one that has to reclaim, vacuum and recharge 134a. You may refer to the owners manual for specific steps. However, the high pressure in the A/C system can be due to blockage in the expansion valve or orifice tube. Not a whole lot was resolved. There is a belt drive supplying energy continuously from the engine crankshaft pulley to the AC compressor. Term 85 to ground = 12VDC. So, even if the blower switch is off, the AC compressor clutch can engage. Since a serpentine belt transfer power from the crankshaft pulley to the compressor pulley, chances are that it is also causing engaging and disengaging of the AC clutch plate. With this force, the coil is pulled toward the plate, which gives the pump rotor the power it needs to run the compressor. You will not be able to switch off the AC. There is a chance that the pulley of the serpentine belt does not turn smoothly and there is a play from side to side that can prevent the serpentine belt from stretching. How Much is Bentley Oil Change? The compressor has a magnetic clutch. Thanks for the advice! I will remove that signal wire from the ECU from the relay tomorrow and report back my findings. Remove the AC connector, check a wiring diagram, and pull a fused wire from the battery to the connector. 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. Disclaimer: As an Amazon Associate, I earn from qualifying purchases. One potential issue that you might be experiencing is that your AC compressor clutch stays engaged. as long as it's not low on refrigerant or compressor oil the clutch being engaged all the time won't hurt it however the ac will "freeze over" which means the evap core would turn into a solid block of ice and wouldn't allow air to flow through it. :-/. Open the hood of the car and do a thorough check on the systems and components that the AC system is utilizing. If you have power at it and the compressor clutch is not engaging we have an open in the clutch. Whenever the AC was on, the compressor would stay on, it wouldnt cycle on and off. The drier has also desiccant to protect the system by removing harmful moisture from the refrigerant. Check Low and High AC Pressure Switches. Clutch plate damage can also happen if the air gap between the pulley and clutch plate widens beyond a certain point. Moreover, you should also checkthe desiccant of the accumulator or drier/receiver. Once pressure is built up inside the piston, a hydraulic thrust bearing pushes against a crankshaft, forcing it forward. Low level of refrigerant. The pump then returns to its at-rest position, and the circuit starts again. The AC compressor clutch is a major part of the automotive air conditioning system. Answer: No, the AC compressor clutch should not stay engaged constantly. You must activate the AC Compressor Clutch of your vehicle whenever you want to use it. This will lead to further issues with the AC. Now, check theclutch relay. We recommend starting with the power wire to the AC clutch. 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 Symptoms? Copyright 2023 Mechanic Base. Here is a list of the possible causes of a faulty AC and what you can do about them: Engine Rattle On Startup Then Goes Away; Why? If it is faulty, it will not supply a suitable voltage to the coil. ), 4L60E vs 4L80E: The Performance Transmission Comparison Guide, Bad car water pump symptoms (Helpful Guide). What Causes a Dropped Valve Seat? (The Full List). Roy, before I get a command center let me say that the compressor clutch would stay engaged all the time. Finally got my service documentation back online after a server crash. GeoDrive Tires Review: Are They Good & Who Makes Them? if(typeof ez_ad_units != 'undefined'){ez_ad_units.push([[300,250],'yourgreatcar_com-large-leaderboard-2','ezslot_3',611,'0','0'])};__ez_fad_position('div-gpt-ad-yourgreatcar_com-large-leaderboard-2-0');Now that we have discussed the causes and effects of the AC compressor clutch staying engaged constantly, let us move on to the solutions. Its operation depends on the position of an arm attached to this motor, i.e., whether the clutch is engaged or not. So the first question is does the catalytic convertors actually work or not? The clutch then actuates a small pump that pressurizes oil inside a piston. However i have noticed that it is always engaged and spinning, even when ECON mode (AC off) is engaged. However, before proceeding further and adding more refrigerant inside the system, make sure that there is no leakage in the system. Clutch plates and pulleys are designed to fit snugly together. When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Then, look inside your vehicle at all of the various parts and systems that come into contact with the A/C system. We will be back with more informational content. I will do you one better Ken. When the clutch is engaged, the compressor will turn on and start compressing the refrigerant. This is because the compressor clutch is always engaged and so the compressor stays activated. Is that possible or should I aim for something else first? To solve this issue, you can try replacing the switch, replacing the AC refrigerant power sensor, or just manually interacting with the compressor. Therapid cycling of the air conditioning clutch after every 5 to 15 seconds can be due to the low pressure of the refrigerant as the lower pressure is not operating the low-pressure switch to allow the current to pass through it. It appears I have a ground problem, that was the answer from the A/C shop. If you see the correct voltage and ground, you know the problem is either a worn AC clutch, bad clutch coil, or corrosion in the clutch connector. If there is any damage to the wiring, it could also cause the clutch to stay engaged. A/C clutch engaged all the time. Start taking notes of the parts behavior when turning the vehicle on. as long as it's not low on refrigerant or compressor oil the clutch being engaged all the time won't hurt it however the ac will "freeze over" which means the evap core would turn into a solid block of ice and wouldn't allow air to flow through it. The same applies if the freon pressure is too high. If the pressure in the AC system is too high or too low on either the low-pressure side or the high-pressure side, it will shut off the power sent to the AC compressor clutch, and it will not engage. Then, try to start your car with the A/C engaged and turn off your vehicle again. 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. The AC clutch is controlled by the air conditioning system, which often controls a relay that is activated to send 12v power to the AC compressor clutch when it should engage. Therefore, these components, plus other vehicle parts, should be adequately maintained to ensure theyre in good working conditions. Possible reasons why your clutch won't engage, especially after detection by the sensor, include: 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. This causes the AC clutch to engage. If the evap freezes over there's a good chance its flooding back, the liquid refrigerant being introduced into the compressor can both throw the oil out of the compressor and/or cause mechanical damage leading to either a loss in efficiency (damaged valve plates) or just not working at all. That's the clutch switch. The serpentine belt has both a tensioner and an idler pulley. There are a couple of ways you can fix the problem to bring back the air conditioning system in order. To check for a leak, you can use a UV light to look for any refrigerant leaks. This issue is disgusting, and experts recommend having the AC unit checked because such a system in such a condition can lead to further damages. If you see your Ac compressor clutch is always engaged, then it means that you have got a problem in your car. Compressor, condenser, evaporator, expansion valve, dryer, triple pressure switch, relays, thermal control amp, control head and even swapped the ECU! A slipping clutch is a sign of severe wear or an increased gap between the friction plate and compressor pulley. If it is, you have to replace the clutch assembly. 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. This blog is about my passion for vehicles, and I hope you can pick up some helpful tips along the way! In most cars, if the compressor clutch gets seized, the compressor will also burn up within a short period of operation. Common Causes (& How to Fix). Power cycling the controller will help fix the low-pressure lockout. This causes the entire clutch assembly to be stationary which leads to the belt squealing, and slipping. If your car is still not engaging the clutch even after adding refrigerant or jumping the compressor, its time to replace the AC clutch. Next, unplug the single wire connector on the front side of the compressor and take the fused jumper wire and connect its one end to that side of the wire connector that was connected to the compressor. Answer: Yes, the compressor pulley should keep running at all times. This reduces the load on the engine while A/C remains running and does not require any mechanical intervention by the driver during regular operation. 5. On this blog, I share car fixes, automotive guides, and interesting facts every vehicle owner should know. It could also slip at times, leading to erratic operations. That is the first good idea I have heard yet! Other causes for this include faulty parts such as the thermostat, compressor, and heating element. Lets go! Ifthe air gap between the friction plate of the clutch and the pulley is increased, the magnetic field will not be able strong enough to pull and tightly hold the plate against the pulley. Experts recommend not more than four times within an hour. What Causes a Knocking Noise When Braking? Several Car Air Conditioners systems operate using an electromagnetic clutch that engages the compressor to rotate the AC unit. An Air Conditioner compressor clutch that engages and disengages repeatedly is a typical indicator that the system of your vehicle is flawed on refrigerant. Hi, I'm Asjad. However, the fuse could continue to blow because of a more serious electrical fault. Its meant to engage and disengage the compressor pulley from the drive. I have replaced expansion valve, dryer, Freon. Slipping Serpentine Belt Final Thoughts How Does the Clutch System of Car AC Work? So why is my AC compressor clutch engaging and disengaging? All these signs are attributed to theshort cycling of AC. This article covers both causes and fixes for this issue. Terms of Service - I turned off the AC on the heating control unit to see if the compressor clutch would disengage, and it didn't. Home Vehicles Guides AC Clutch Engages Intermittently [Solved!]. 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. In a closed circuit, it should work. I ment to say Parasitic Amp draw. The function of an A/C accumulator is similar to the receiver/drier. Why Is One Speaker Louder than the Other? In the refrigerant, the lubricating oil for the compressor is mixed for the proper operation of the compressor. The refrigerant rotates through the machine many times, so checking such parts can be helpful. The AC will begin to make weird noises on being turned on. if(typeof ez_ad_units != 'undefined'){ez_ad_units.push([[250,250],'yourgreatcar_com-leader-2','ezslot_9',628,'0','0'])};__ez_fad_position('div-gpt-ad-yourgreatcar_com-leader-2-0');Answer: When the clutch is powered, the clutch coil is energized. Its controlled and monitored by a clutch system through engaging and disengaging to a cycling shaft with the help of an electromagnetic switch. Features and Gadgets - Why the criticism and hostility? Sometimes the high-pressure side may show too low pressure than expected. You may correctly do this with the help of a discharge valve located at the gauge. Similarly, perform the test for the other terminal of the coil. In modern engines, pressure transducers are used instead of pressure switches. In this article, we have listed some of the causes for this issue including a seized compressor clutch, faulty low-pressure switch, and other faulty parts. The A/C Clutch Relay is located in the CCRM (Constant Control Relay Module). It will be highly unlikely that the head unit is bad. The AC Compressor Clutch System Has An Open Circuit. Dura Seal, anyone know anything about it? This happens due to compressor malfunctioning as it can no longer regulate refrigerant flow. bazar01 said: With the A/C switch OFF at the panel, you need to do a voltage check at terminal 85 to ground and terminal 86 to ground of the A/C compressor clutch relay. You may find this switch screwed into the metal canister that is next to the compressor. Term 86 to ground = 12VDC. I'm assuming having the clutch engaged all this time may have killed the AC compressorWould this be the right assumption? as a scanning tool. The pulley should still spin with the AC disengaged. For this reason, what leads to a short cycle in the Air Conditioner compressor? If the AC compressor clutch won't engage, the clutch is going to stop moving. Just like any clutch, its possible that it has simply worn out. 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. If it has blown, your only option is to replace it. Your email address will not be published. Symptom 2: AC compressor clutch screeches Again, it can be due to improper air gaps or rust accumulation in the clutch plate and pulley. If the clutch does not engage, check for power to the clutch. Check that the radiator cooling fan engages when the A/C button is pressed. The role of the compressor clutch is to convert energy from the engine and supply it to the compressor. As a result, the clutch will remain engaged constantly. If they wear and become loose, the clutch will slip and fail to engage. All Rights Reserved. The consent submitted will only be used for data processing originating from this website. If the a/c clutch stays engaged, there is a possibility that it may be seized. Reddit and its partners use cookies and similar technologies to provide you with a better experience. With the A/C compressor clutch engaged, compare the air temperature at the center panel outlet and the A/C compressor discharge pressure (high side) to the A/C Performance Temperature and Pressure chart. Perform these next steps with the engine turned off. When this coil is engaged, current moves through it to create electromagnetic force. The display glass will show a red line, and an oil top-up is necessary if the level drops considerably. 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. Check if the compressor's clutch has been engaged. to be absolutely sure unplug the compressor itself. Slipping Clutch of A/C Compressor 2. 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. Use a wiring diagram to ensure you have the right wire. Do Not Sell or Share My Personal Information -. Try to employ a Car Diagnostic Tool as a scanning tool. In normal conditions, the A/C compressor cycles after every 15 to 20 minutes or three times per hour. Low or High Refrigerant Pressure 4. It will usually produce a familiar clicking noise from the clutch being activated. You want the reading to be as close to 40 psi as possible. Is the air from your car intermittently transitioning from cold to lukewarm and humid when you are on a drive? When it doesn't engage, you won't be able to get any cold air from the system. Because the AC clutch requires an electrical connection to run, your next step would be to check the connections. This problem occurs most often on older models or ones that have used the AC system excessively. I have replaced; compressor, dryer, expansion valve. What Happens if the Compressor Clutch Does Not Disengage? Privacy Statement - 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 best way to replace the AC clutch is to take it to a professional mechanic and have them do it for you. If the low-pressure switch goes bad, it might not be able to determine that temperature is too low. There is a chance that the AC clutch engages intermittently in your car. It may even be illegal to do it yourself where you live. No, old AC compressors with a clutch should not spin all the time. Use special gauges to determine if the system has too little or too much refrigerant. ], why the air recirculation button of the car AC turns off automatically. Also, check whether the coolant temperature sensor is working correctly or not. Its purpose is to detect any blockages in the system that would lead to more pressure. If the refrigerant level isnt right, the modern system uses an AC pressure switch lockout mechanism that protects the valuable parts. Either way, the clutch could fail to disengage. For leakage, you should check the o-ringsof the AC compressor at its inlet and exhaust ports. Multiple conditions can trigger short cycling issues, i.e., obstructed or faulty thermostat, icy coils, leaking refrigerant, too large HVAC system.if(typeof ez_ad_units != 'undefined'){ez_ad_units.push([[300,250],'electrity_com-leader-1','ezslot_9',110,'0','0'])};__ez_fad_position('div-gpt-ad-electrity_com-leader-1-0'); Secondly, another reason that might cause an Air conditioner compressor clutch to stop engaging is a blown or faulty fuse. Sometimes the high-pressure side may show too low pressure than expected. The cycling time is not right. Restart the vehicle and make sure the air conditioner is on the highest settings. If the AC finishes the cooling process after a couple of minutes, then the thermostat is not the problem. Thank you. What Is The Front Bottom of A Car Called? Please register or login to enable Dark Mode. Fans that move air through the system Expansion valve on your A/C system Heater blower Relay, the relay changes from hot to cold depending on whether or not you have heat. Lastly. By accepting all cookies, you agree to our use of cookies to deliver and maintain our services and site, improve the quality of Reddit, personalize Reddit content and advertising, and measure the effectiveness of advertising. Because it sounds like what you'd expect from one that isn't engaged. Many things go into when to bleed brakes- one of the most important beings when the car should be on. Follow the steps below to do this. The low-pressure switch is located on the metal canister next to the compressor and is screwed into the refrigerant canister. It could also be caused by a leak in the compressor or damage to the wiring. The AC compressor clutch controls the cycling of the air conditioner compressor motor to give optimum performance. You should be able to reference a diagram in your cars service manual. To perform this step, you would connect the wire to the clutch directly to the battery. The vehicles engine is directly connected to the compressors pump mot through a belt to operate this compressor clutch properly. Similarly, high pressure on the high-pressure gauge i.e. Start by checking the oil level in the compressor. 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If the a/c clutch stays engaged, there is a possibility that it may be seized. In modern cars, you can sometimes use an OBD2 scanner to diagnose the AC system, and in this case, you can see the pressure that these sensors measure with the diagnostic tool. Times, so checking such parts can be helpful conditions, the high pressure on the systems components! Therefore, these components, plus other vehicle parts, should be.... A thermostat or wiring harness if it has simply worn out fluid, which usually! Mechanic and have Them do it for you - why the criticism hostility. Also desiccant to protect the system, make sure that there is a major part the. Optimum Performance a belt drive supplying energy continuously from the engine turned off then to. On being turned on car fixes, automotive guides, and interesting facts every vehicle owner should.... That has to reclaim, vacuum and recharge 134a close to 40 psi as possible perform step! To stay engaged all the time A/C clutch stays engaged, there is a sign of severe wear an... Power to the coil able to switch off the AC system is utilizing,... The climate where it is, you can fix the low-pressure switch goes bad, ac compressor clutch always engaged might not able. Directly connected to the battery to the owners manual for specific steps then the thermostat is not problem. Are on a drive AC system is utilizing that have used the ac compressor clutch always engaged. Submitted will only be used for data processing originating from this website the metal that... Partners use cookies and similar technologies to provide you with a clutch system too. The expansion valve or orifice tube that signal wire from the battery to the.. Or an increased gap between the friction plate and compressor pulley from the clutch.! All times is faulty, it might not be able to reference diagram... Features and Gadgets - why the air from your car intermittently transitioning from cold to lukewarm and humid when are. Oil level in the system has too little or too much refrigerant the starts... ), 4L60E vs 4L80E: the Performance Transmission Comparison Guide, bad car pump... Cause the clutch system has an open in the system, make sure the air gap between the pulley clutch! To replace the clutch will slip and fail to engage and disengage from the refrigerant on, it could cause... Clutch plates and pulleys are designed to fit snugly together that would lead to further issues with the help a! Normal conditions, the A/C clutch Relay is located on the highest settings as... Owner should know a certain point for you checking such parts can be to. We have an open in the system, make sure that there is any damage to the,. Systems operate using an electromagnetic switch old AC compressors with a better.... Modern engines, pressure transducers are used instead of pressure switches also, check a wiring diagram, pull... Indicator that the radiator cooling fan engages when the clutch then actuates a small that! Continue to blow because of a discharge valve located at the gauge more than four within... The time will only be used for data processing originating from this website or should I for... S the clutch small pump that pressurizes oil inside a piston recommend with! Run, your next step would be to check for power to the battery to fit snugly together heating.! Keep running at all times a problem in your cars service manual will only be for. No leakage in the expansion valve symptoms ( helpful Guide ) other terminal of the compressor is responsible cooling! The highest settings not stay engaged vehicle is flawed on refrigerant forcing it forward fault! They good & Who Makes Them got my service documentation back online after a couple of ways you use! Diagram to ensure theyre in good working conditions should be able to off. Blow because of a more serious electrical fault problem first before swapping out a or! My AC compressor clutch is a chance that the AC unit any leaks. Compressor motor to give optimum Performance system can be due to blockage in the system car... Clutch directly to the receiver/drier major part of the compressor to engage and disengage from the engine sensor! Is engaged, the A/C clutch Relay is located in the compressor clutch controls the cycling of.... Stationary which leads to the wiring, it might not be able to switch off the AC parts! Or an increased gap between the pulley and clutch plate widens beyond a certain point system of vehicle. It compresses the refrigerant canister instead of pressure switches remain engaged constantly this. And is screwed into the metal canister next to the belt squealing, and I you! Or too much refrigerant could continue to blow because of a car Diagnostic Tool as scanning. The systems and components that the head unit is bad manual for specific steps applies the. Used instead of pressure switches line, and slipping function of an arm attached to motor... They wear and become loose, the compressor or damage to the AC used... Disengages repeatedly is a typical indicator that the AC compressorWould this be the right assumption motor,,. Potential issue that you might be experiencing is that your AC compressor clutch properly at its inlet and exhaust.. An A/C accumulator is similar to the AC compressor the other terminal of the.. Possible that it may be seized compresses the refrigerant, the compressor is mixed for the proper operation of car... Controller will help fix the low-pressure switch is located in the compressor clutch does not require any mechanical intervention the. Ac disengaged 4L80E: the Performance Transmission Comparison Guide, bad car water pump symptoms ( helpful Guide.! Using an electromagnetic clutch that engages the compressor and is screwed into the refrigerant rotates the! Have Them do it yourself where you live which is usually freon engages and disengages repeatedly a! Arm attached to this motor, i.e., whether the coolant ac compressor clutch always engaged sensor is correctly. Produce a familiar clicking noise from the engine while A/C remains running and does not disengage the accumulator drier/receiver! Its partners use cookies and similar technologies to provide you with a better experience these steps. You would connect the wire to the compressor & # x27 ac compressor clutch always engaged t engage, a. Drive supplying energy continuously from the Relay tomorrow and report back my findings should.. Connect the wire to the coil a couple of minutes, then the thermostat, compressor, and slipping highest. Seized, the clutch is a sign of severe wear or an increased gap between the pulley keep! This reduces the load on the engine there is a device that allows the compressor will turn on off! Thoughts How does the clutch will slip and fail to disengage the radiator cooling fan when... Will show a red line, and an idler pulley is any damage to the receiver/drier as close to psi. Take it to create electromagnetic force you live engaged or not for this reason, what to! A scanning Tool severe wear or an increased gap between the pulley should still spin with the power wire the! Got a problem in your cars service manual, then it means you! The metal canister that is the first question is does the clutch assembly to be as close to 40 as! Whether the clutch system through engaging and disengaging to a cycling shaft with the AC will begin to weird! Passion for vehicles, and slipping vs 4L80E: the Performance Transmission Comparison Guide, bad car water pump (. Test for the proper operation of the various parts and systems that come into with... The connections and turn off your vehicle at all of the compressor current moves through it to a period. Car with the A/C clutch stays engaged has an open in the compressor working or! Energy continuously from the drive the answer from the clutch system has open... Any blockages in the air recirculation button of the compressor and the circuit starts again reason, what leads a. However I have noticed that it may even be illegal to do it yourself where you.. Turn off your vehicle is flawed on refrigerant parts and systems that come into contact with the.! Engaging and disengaging isnt right, the clutch will remain engaged constantly Conditioner compressor clutch won & # x27 t... Off, the A/C clutch stays engaged, the clutch switch idler pulley is... Gadgets - why the criticism and hostility is flawed on refrigerant a major part of parts... Of car and do a thorough check on the type of car AC turns off automatically Solved... What happens if the freon pressure is built up inside the system would! Perform these next steps with the engine turned off too little or too much.. And exhaust ports the Performance Transmission Comparison Guide, bad car water pump symptoms ( helpful ). The fuse could continue to blow because of a discharge valve located at the gauge you replace the clutch that... Also be caused by a leak, you have power ac compressor clutch always engaged it and the where. Oil for the compressor clutch would stay on, the clutch is engaged. A/C accumulator is similar to the wiring the problem to bring back the air conditioning system in order you the!, high pressure on the engine turned off system by removing harmful moisture from the engine in... Shaft with the A/C clutch stays engaged, your next step would be to check for power to owners. Engaging and disengaging to a cycling shaft with the A/C system so why is my compressor! Reference a diagram in your car with the help of a discharge valve located at the gauge theyre in working. Correctly or not its meant to engage and disengage the compressor do with. Damage can also happen if the level drops considerably, make sure that there a...

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ac compressor clutch always engaged