Ac Compressor Clutch Turns On And Off

Putting on the ac belt was the hardest part. It was working great a couple of weeks ago, but now only blows warm air. Apply the parking brake and disconnect the negative battery terminal using a battery terminal wrench. A quick way to confirm compressor clutch failure is to manually turn the AC on and off. So the wire has juice, but compressor or clutch dont turn on to cool the air. ( if your clutch is original it will most likely fail if it has not. Typical Subaru Air conditioning Problems explained. A 1999 Silverodo has its own drive belt, and a top off for the system. I have 100,000 plus miles. While driving between 2000-3000 rpm the compressor is making a squealing noise. I did have to remove the compressor from the system to pull the motor before I had the chance to charge it when my cam went, so some oil was lost, but only about a tablespoon. The only thing you can do when you have caught it is turn the AC button on then back off. The Clutch On My Ac Compressor Cycles On And Off All The Time. As the freon pressure builds, the switch will turn on allowing the clutch to engage the compressor. Is that because it can't fill if the compressor doesn't kick on?. Also, I wouldn't recommend hot-wiring your AC clutch. 6L Air Conditioner. I hace a 2000 lincoln towncar my car idles fine with the ac off but when I turn it on it’s a bit noisy (and it’s not the clutch it’s the compressor) also with the ac on the car starts idling rough to the point of shutting off what can it be?. The AC system may have a sight glass on the drier unit. Can You Guys Help w/my Silverado AC Clutch/Compressor? Gordo,with the key on and engine off,turn on the A/C and tap the cluth face to see if it engages,if so,the. Next, I ran a hot wire from the battery, directly to the clutch, just to verify that the clutch is really dead. In simple terms, an A/C Compressor is a pump. As you turn the clutch hub, there should be minimal resistance. Fixing AC compressor problems increases the unit's efficiency and extends its life. If it's not, continue reading in the following sections to uncover some common causes of a car AC clutch that won't engage. Driving on a hot, summer day can be quite unbearable when your car's air-conditioning breaks down. When you push the ac button, clutch should engage and stay on as long as the button is not pressed again. Books say the compressor must turn on to get a proper reading. Your issue sounds like the compressor has failed (bearing, debris in the pump, etc. After started filling, low side gauge shot up to 98 psi and Mike closed low side gauge. Figure out what’s wrong with your car’s A/C and fix the problem yourself, all for less than the diagnosis alone would cost at most auto repair shops. ac compressor clutch/coil removal DIY Here we go, as I promised, - enjoy! take a note of the belt routing before starting this procedure 1. Will low refrigerant level cause the AC compressor clutch to not engage 15 Answers. At the compressor you'll find a quick disconnect wiring terminal that runs to the compressor clutch. This prevents compressor damage, since the lubricant for the compressor is circulated through the. If I turn it off (either turning the knob off for the blower or pressing the push button for the AC) then turn it back on i can hear the ac kicking on and the air start to get cold. An air conditioning problem has reared its ugly head with the warm weather coming. I put a small can of oil and not quit a can of 134a. -Pull bumper, turn on AC, stick eyes and ears down there. You can notice this by the water dripping from a window air conditioner in the summer. While many people believe the compressor puts out cold air, that is incorrect; it actually creates heat. Give the clutch a few minutes to cool down before turning the AC back on. The wiring for the A/C system differs depending on year and what engine your Fiero came with, so all configurations will be discussed in this article. The clutch can seize, which permanently keeps the compressor activated; or it can break, which means the compressor will not be able to receive engine power. Began filling low side with new can as vapor, with hi side closed. 1997 Ford Ranger AC Compressor kicking on and off every 10 Turning When System Is Off, Noisy. The fact that it cycles on and off is either low pressure OR the trinary switch. The compressor is the 'heart' of the air conditioning system, moving refrigerant through the system. Inspect the clutch located at the front of the AC compressor and make sure the clutch rotates freely. So I took it to the dealer and they changed the compressor to a new upgraded model under warranty (3 weeks ago) I started my car the other night and I noticed the compressor was coming on and off every 20 to 30 seconds, when the car was 1st started. AC/Delco replaces the clutch and compressor as a unit. Turn off the AC and it quits making noise and the idle speeds back up. Frustrated with ac! compressor hub turning slow SOLVED! Getting pretty frustrated! I have a 93, had it abt 2. So next time that your air conditioner compressor rapidly turns on and off in your car, it may not be due to low freon levels – but because it is over-charged! Those cheap low-pressure testers that come with the charge kits only tell you part of the story. If the clutch engages but the compressor does not turn (the belt will start to slip and squeal), the compressor is locked up and you need a new compressor. I accidently broke my ac clutch wire clean off the coil. Eventually, even that fails. After started filling, low side gauge shot up to 98 psi and Mike closed low side gauge. The car only has 22k miles, and I always run the A/C compressor, either with the DEF or A/C on, so it always gets used. So I just turned off the compressor and used vent only to try to get home. I did have to remove the compressor from the system to pull the motor before I had the chance to charge it when my cam went, so some oil was lost, but only about a tablespoon. She recently ran her air conditioner and it never got cold with it being about 80 degrees outside. My AC is blowing only warm air. A bad clutch will lead to a bad compressor and vice versa. Determine if it the compressor or the clutch. Began filling low side with new can as vapor, with hi side closed. I am worried about damaging my compressor. It just spins free with the belt and the front part never turns. Because of the high-pressure load the piston creates during startup, the motor uses its start windings to reach full speed. Fixing AC compressor problems increases the unit's efficiency and extends its life. There is a 'sheer plate' mounted to the front of the compressor that when the compressor fails, will break off, and can look like it is missing a clutch. When I push the AC button only the blower turns on, no AC. After that, I only needed to read the compressor replacement procedure, to convince my self that I don't really want to deal. It shuts the compressor off at approximately 22 to 26 psi and turns it on again a around 44 psi. This prevents compressor damage, since the lubricant for the compressor is circulated through the. Now try to turn the clutch plate by hand, that will turn the ac compressor. plate assembly from turning. This indicates a problem with the A/C compressor clutch relay or related wiring. Well, currently no issues with getting the compressor on. The outer part of the pulley assembly is always turning when the engine is running, and it should spin freely. The Air conditioning (AC) system in your Subaru is made up of the following. The compressor starts working, creating a low pressure condition for the switch, which then disengages the clutch and compressor. The car is an 03 wrx. (b) Set the dial indicator to the magnet clutch hub. I am worried about damaging my compressor. If the clutch doesn’t engage, the air conditioning compressor can’t pump refrigerant. It would not take. AC/Delco replaces the clutch and compressor as a unit. Air conditioner intermittently works. Then look at the front of the compressor clutch. A/C starts off cold then blows warm Help, Advice, Owners' Discussion and DIY Tutorials on S40 and V40. Have someone in the truck start it while you observe the clutch/compressor (make sure A/C is off when you start it). There may be slight changes in HOW cold it is. The port hole should be clear with compressor off. The compressor turns on then cuts off as if its low on freon but its not. Incoming search terms: Ac Compressor Locked Up,Ac Compressor Locked,How To Unlock An A/c Compressor,Locked Up Air Conditioner Compressor,What Happens When Your Compressor Locks Up,Ac Clutch Locked Due To Low Freon How To,Any Connection Of Car Air Condition And Catalytic Converter,Can Ac Compressor Locks Motor,Can You Run An Engine With A Locked. Now try to turn the clutch plate by hand, that will turn the ac compressor. AC Compressor Not Turning On. A/C compressor turns on and off Oct 15 2012, 10:17pm Hey guys got a little issue with my dads truck the compressor turns off and on the entire time its on and we were told it was the temperature sensor that was bad. The cycling on and off of the compressor is usually due to the increase in pressure as you charge the system. I've got the opposite problem, my clutch never kicks out when I have the AC on (clutch works just fine) and my condenser ices over to the point that it either blocks airflow through the ducts or it starts blowing snow around the truck, it'll stay frozen solid until I manually turn off the AC for a few minutes and let it defrost then I have good. Once the switch turns the compressor off the pressures wil begin to equalize. I turn on my A/C and it just blows air not cold air, just air. It works the same way when it senses there is too much pressure in the system. Check to ensure its not your belt? Spray some belt ease/cleaner on it and see if it goes away. Learn how to examine the component and the easiest way to fix it in both new and old cars. Whether your A/C is on or off, the pulley always turns. While many people believe the compressor puts out cold air, that is incorrect; it actually creates heat. I can do this 5 or 6 times. My 1997 F150 4. I'm fairly certain I am having this problem. It worked perfectly. So I took it to the dealer and they changed the compressor to a new upgraded model under warranty (3 weeks ago) I started my car the other night and I noticed the compressor was coming on and off every 20 to 30 seconds, when the car was 1st started. Idle slows down and I can see the clutch is not turning at all. While many people believe the compressor puts out cold air, that is incorrect; it actually creates heat. When I turn the ignition switch to on, the ac compressor clutch will engaged. On some settings of AC, compressor runs specifically, and these settings are to be avoided. The Clutch On My Ac Compressor Cycles On And Off All The Time. What could be causing this and how do I fix it?. Motorcycle Parts. My '88 Turbo S has a great AC system: complete gone-through within 5 years, blows very cold, though the compressor cycles on/off every 10-15 seconds or so continuously: regardless of temperature, time, speed, etc. Repairing a Dodge Sliding Rear Window. Hi all, I figure since the 951/944 AC systems are pretty similar, I might have a better chance of someone explaining this to me on this forum. off the body of the J 33013-B in. About 10 minutes later I can restart the air conditioner, and it cools perfectly. -Pull bumper, turn on AC, stick eyes and ears down there. If you do find that your car’s air conditioner compressor is cycling on and off too quickly, then it likely indicates that your vehicle’s electronic module is failing. I have an intermitted AC clutch issue. So, the compressor is not mechanically locked up. in the older cars,there was a setting called max air. Frustrated with ac! compressor hub turning slow SOLVED! Getting pretty frustrated! I have a 93, had it abt 2. Then look at the front of the compressor clutch. My compressor engages, but in hot weather it turns off. It is the part in the center of the pulley--the A/C clutch-- which engages when the A/C is turned on. My 2001 lesabre has a noise from the compressor clutch. Runs for 11 min then it quits. When the compressor starts bubbles will form but quickly clear up. It has one wire going into the back top of the compressor and another wire into the top. I've been working with a mechanic for 4 weeks now and testing to find problem. Before making any final decisions, you need to perform a little troubleshooting […]. -Light straining motor noise has not re-occurred since last week. Low charge in the system, caused by a leak, may produce over-cycling and quickly wear the clutch. A few days ago the AC just stopped blowing cold air. Get a Denso with clutch installed. If there is cold air, find and fix electrical problem preventing compressor clutch from engaging (a/c fuse, a/c on off switch, bad a/c relay, bad trinary/pressure switch, bad "compressor locked" detection switch, bad evaporator temperature switch). If the clutch engages, then check the power supply to the clutch, including the system protection devices and electronic compressor controls. Driving on a hot, summer day can be quite unbearable when your car's air-conditioning breaks down. I did my own check on the positive cable sending power to the compressor clutch coil. Repeat the test with the A/C set to "Off". Hi! I had a problem with my 2004 MustangGT 2v4. Have the person in the truck turn on the A/C. This clutch turns your compressor on and off based on your demands. Putting on the ac belt was the hardest part. Then switch on the ignition key and turn on the dash air. Well, sometimes these sensors short out and will not allow compressor operation. As far as the AC compressor. It reads 14V on my multimeter when we turn the AC on (but doesnt engage the clutch) and 0V when the AC is off. With AC on max, I popped the hood and checked to see if the clutch on the compressor was engaged. (c) Connect the battery positive lead to terminal 3 (MG+) of the magnet clutch connector and the negative lead to the earth wire. It would not take. A faulty compressor clutch can be replaced but it is generally recommended to replace the whole compressor to save time and additional cost. on this setting,the compressor would run all the time. The pressure switch looks new like it was replaced and the system tubes etc. Disconnect the power wire to the clutch and apply 12 volts to the clutch field winding terminal. To reprogram for manual A/C control: 1. After we are done we turn it off. -Pull bumper, turn on AC, stick eyes and ears down there. When the compressor doesn’t turn on at all, it can mean a couple different things. If #3 is the case, try manually engaging the clutch. A/c was clicking so took it in for some work. It has one wire going into the back top of the compressor and another wire into the top. Back off the power steering drive belt and remove the aircleaner box, this will give you complete access to the pulley/clutch. The wiring for the A/C system differs depending on year and what engine your Fiero came with, so all configurations will be discussed in this article. If the clutch engages, then check the power supply to the clutch, including the system protection devices and electronic compressor controls. Clutch on compressor is not turning. All settings are about user. In this video, I show you how to tell if a car's AC compressor clutch is engaging. If the compressor clutch engages and turns the compressor, but the A/C still does not blow cold air, the system is probably low on refrigerant and needs to be recharged. Mine had a bolt already instead of an Allen wrench so I just used a 10mm socket and a pair of tongue and groove pliers to hold the clutch to get it off. Turn off the engine and place the SUV in park. Since the compressor pulley is constantly rotated by an accessory belt that is typically connected to the crank pulley, a compressor clutch is necessary in order to turn the system on and off. A quick way to confirm compressor clutch failure is to manually turn the AC on and off. If that fixes it you are done, if not swap the compressor. I have my neighbors 1999 dodge durango V8. With engine off, I rigged up battery volts to the pin socket that feeds down to the clutch. Find Bike Parts, Bodies, and Frames Right Here 4x Motorcycle Led Turn. A 1999 Silverodo has its own drive belt, and a top off for the system. the compressor pulley may be turning all the time,but there is a clutch inside of the pulley,that engages when the compressor is actually working. The most likely answer is that there is a leak in the system and the refrigerant has escaped the system although there are problems with that explanation. If there wasn't enough in the system, it wouldn't even do that. I checked voltage coming to it, and it was 12V when the A/C called for it to come on, and zero when it cycled off. I then removed the under-hood fuse & relay cover and "tapped" on the relay that controls the A/C compressor clutch with my fingers. Putting on the ac belt was the hardest part. Maybe you should take it to a reputable AC shop and get an estimate. Could these two issues be related or am I off-base? I have a 2011 Cruze with 79k miles and these seems to be too many issues given the mileage so thought they might be related. How to Restart an AC Compressor Always turn off the proper breakers before beginning this fix. That's what I did to mine last year. This clutch turns your compressor on and off based on your demands. If the air conditioning or AC system does not work in your vehicle at all, there is a possibility that some problems have occurred with the compressor. Why would the clutch on my air conditioner fail? An air conditioner clutch is mechanical and electrical and is prone to wear and tear. I changed the selector switch on the dash to all positions one at a time and observed the AC compressor. Conversely, when the electromagnet device or the a/c compressor clutch coil is turned off, the friction plates will spring apart in effect. I heard a "click" and could now see that the compressor was turning (center was spinning). The clutch is always disengaged and the compressor pulley rotates freely untill you switch on the AC. pull the wired molex off, with the ac set on max cooling, jump out the two wires with a wire or paperclip, if the clutch on the ac compressor engages, check the cab to see if its cooling, if it does cool the switch needs to be. You might see that under heavy acceleration, for example. The pulley bearing slips over a sleeve outside the shaft, so the pulley moves freely. Then look at the front of the compressor clutch. They normally last 100,000 miles or more, under normal conditions. The A/C compressor pulley/clutch is a piece of cake to do. The compressor turns on then cuts off as if its low on freon but its not. The AC compressor will normally cycle on and off while it's in use, depending on the demand for cool. I accessed your websit for info regarding Stratus. Still got a full can. Problem comes when AC is turned on, indoor air, and lowest indoor fan. I've tried to search the webz and see that it may be the clutch or it could be the compressor. I have my neighbors 1999 dodge durango V8. This is not the case of clutch slipping. The compressor clutch relay may be sticking closed. Is that because it can't fill if the compressor doesn't kick on?. Get the junkyard compressor swap the clutch first. The a/c system is capable of turning the evaporator housing into a solid block of ice. Have the person in the truck turn on the A/C. The only thing you can do when you have caught it is turn the AC button on then back off. Also, I wouldn't recommend hot-wiring your AC clutch. So the wire has juice, but compressor or clutch dont turn on to cool the air. Hope this helps. AC–90 AIR CONDITIONING – COMPRESSOR AND MAGNETIC CLUTCH AC 3. It is low on freon and that is the reason for the cycling. I have no problems with the A/C, but when I use the heater (more often) the compressor turns on and off too frequently. If you turn the center part (clutch disk) and it does not move freely you might have a bad compressor. They normally last 100,000 miles or more, under normal conditions. Driving on a hot, summer day can be quite unbearable when your car's air-conditioning breaks down. I put a small can of oil and not quit a can of 134a. A defective relay, compressor clutch coil or damaged compressor are all possibilities. With engine running, fan and ac switch on, I was able to detect good voltage at the terminal. 1) Turn on the vehicle's engine and turn the air conditioner on and set the AC system's fan to high speed. The compressor didn't fail but the wagon was already on its last legs so I went without ac for one year before donating it. use 15mm open end wrench or anything similar to pull serpentine belt tensioner towards the front of car, this will release the tension of the belt and have a nail ready so that you can push the nail through the both openings and lock tensioner in released. To reprogram for manual A/C control: 1. off the body of the J 33013-B in. Then switch on the ignition key and turn on the dash air. If you do find that your car’s air conditioner compressor is cycling on and off too quickly, then it likely indicates that your vehicle’s electronic module is failing. So, the compressor is not mechanically locked up. the clutch engages in and out depending how low you have the setting. The next thing on my list was to check the compressor relay. This keeps the Evaporator from freezing. And if i try to turn it on it will still do the same thing about every minute. The AirCon can switch itself on and off intermitantly when you have a faulty resistor pack/thermostat, faulty track on your Accelerator position switch, faulty Hot-Cold control, faulty system pressure switches, compressor clutch, or associated relays and wiring. What could be causing this and how do I fix it?. Still got a full can. With engine off, I rigged up battery volts to the pin socket that feeds down to the clutch. What turns the ac clutch off and on. Is it normal for the compressor clutch to engage and disengage when using the heater? I understand that when using A/C and the compressor goes on and off too frequently, that the freon might be low. If it's still too wide, it can be slipping, reaching the clutch overheat cutout switch, then when it cools back down it will kick on. My 1997 F150 4. There is a 'sheer plate' mounted to the front of the compressor that when the compressor fails, will break off, and can look like it is missing a clutch. OK, so the air con system says: ‘The cabin temp is getting too high: run the compressor. I Disconnected the battery and waited 15 minutes and re-connected the AC compressor connector that I had removed to manually engage the clutch and reconnected the battery and test drove the car for 15 minutes. 1) Turn on the vehicle's engine and turn the air conditioner on and set the AC system's fan to high speed. If it shuts off them, test the socket for trigger ground coming from the PCM to energize it. When the compressor starts bubbles will form but quickly clear up. Some cars also have an ambient temp sensor to keep the compressor from coming on if the outside temp is too cold. Since the clutch engages, there is enough refrigerant in the system (pressure) for the clutch to engage. I noticed my A/C compressor stays engaged when I turn the A/C on. And it was. Cost a total of $85 verse around $120 for the clutch + freon. hi in my 2008 altima 2. If your Thermistor is reading 4-5 volts when you first turn the AC on then your Thermistor is defective and needs to be replaced. This motion will leave the compressor back to its stationary state until the compressor coil of your air conditioning is once again pushed against it. In the afternoon when driving home from work with outside temps around 85-90 degrees, the AC will work fine for about 5-10 minutes then the compressor will start to cycle on and off every 6 seconds while driving and the inside vent temprature will rise to 52-58 degrees. It would make constant cold air though, the vent air would never go warm. The following readings were taken using an OTC 500 meter and OTC current measuring clamp; they are off of a 1986 Le Baron: Clutch resistance: 5 ohms, as measured at the clutch connector. Pull the wire connection at the compressor and put a multimeter on it. If I turn the air on and the clutch engages, it seems to make less noise. She recently ran her air conditioner and it never got cold with it being about 80 degrees outside. Incoming search terms: Ac Compressor Locked Up,Ac Compressor Locked,How To Unlock An A/c Compressor,Locked Up Air Conditioner Compressor,What Happens When Your Compressor Locks Up,Ac Clutch Locked Due To Low Freon How To,Any Connection Of Car Air Condition And Catalytic Converter,Can Ac Compressor Locks Motor,Can You Run An Engine With A Locked. To reprogram for manual A/C control: 1. Mike decided to jump the clutch with wire straight from battery to test clutch/compressor, and clutch immediatly engaged. When you push the ac button, clutch should engage and stay on as long as the button is not pressed again. Repairing a Dodge with the Death Wobble. My '88 Turbo S has a great AC system: complete gone-through within 5 years, blows very cold, though the compressor cycles on/off every 10-15 seconds or so continuously: regardless of temperature, time, speed, etc. Over a certain number of years, this stress will wear down the compressor and cause it to eventually malfunction. The next step is to shut down your engine. The compressor will not cycle off when the A/C is on. Thought I try to put some 134 a in( or whatever we have decided to call it by now) lol. The port hole should be clear with compressor off. The most likely answer is that there is a leak in the system and the refrigerant has escaped the system although there are problems with that explanation. Still can't turn the pulley. Classic Auto Air has new clutch brushes. It is normal for the system to have other sensors to monitor for excessively high pressures (over about 450 psi) and to turn off the compressor to avoid the possibility of damage, and also another to turn on or to increase speed of an electro fan when pressures rise to about 275 psi - this pressure will be rapidly reduced by this speeding fan. Re: A/C Compressor Clutch Air Gap Just had that done on my truck, the bill was about 300, that included a new compressor belt. Both the pulley and the clutch should be spinning. The sensor tells the computer what the air's temperature is at the exit point of the evaporator. The compressor clutch is the electromechanical device that turns your AC compressor on and off. Why does my AC compressor cycle on and off is a common question that every AC contractor hears repeatedly. Determine if it the compressor or the clutch. Everything was OK as well. I'm not at home to look at my wifes Tib, but as a check, you could remove the AC belt and try spinning the compressor shaft by hand or with a wrench (it's the inner part of the clutch, not the "ribbed pulley"). Turn on A/C and it makes this horrible squealing noise, turn the A/C off and nothing. It should be difficult but move. Once the AC clutch obviously disengages itself and begins blowing warm air, turn off the AC with the button on the center console. You could try to jump the AC clutch, forcing it to turn on, to see if it's actually working. Air conditioner intermittently works. The AC system may have a sight glass on the drier unit. If it shuts off them, test the socket for trigger ground coming from the PCM to energize it. The clutch on the compressor is what allows the pulley to engage and disengage from engine power so that the compressor is only turning when it needs to be. By attaching a voltmeter between pins 6 and 8, you can monitor the voltage drop across the thermistor. All of these switches were fine and there was 12v on the wire going back to the ECU. About 10 minutes later I can restart the air conditioner, and it cools perfectly. After reading numerous posts on the interwebs, I theorize that that the air gap on the clutch is too large. Books say the compressor must turn on to get a proper reading. Since car air conditioning systems get turned on and off constantly, this power fluctuation puts a lot of stress on the compressor. It says the pressure is high. The A/C compressor pulley/clutch is a piece of cake to do. ) and when the clutch engages it overloads the engine. The outer part of the pulley assembly is always turning when the engine is running, and it should spin freely. -Light straining motor noise has not re-occurred since last week. I've got the opposite problem, my clutch never kicks out when I have the AC on (clutch works just fine) and my condenser ices over to the point that it either blocks airflow through the ducts or it starts blowing snow around the truck, it'll stay frozen solid until I manually turn off the AC for a few minutes and let it defrost then I have good. Edited July 14, 2011 by Dogbone. Replaced compressor clutch, evaporator, switch, and o-rings. When the clutch disengages, it gets louder. It can also break meaning it will not receive power from the engine. (b) Set the dial indicator to the magnet clutch hub. I can turn the clutch by hand with no problem. 018" (about the thickness of a business card). ok at idle(600-700rpm) when you turn the ac on you can feel the truck somewhat shake, very minute, but almost like a slight misfire. Is that because it can't fill if the compressor doesn't kick on?. I am thinking of taking it to a ac shop to get it checked as I am lost when it comes to the ac system. Ac has Freon, he can get it to turn on by shorting out, ( I will have to ask him specifically what and where he shorted it out to get compressor to turn on) It gets cold fast, Then one day it just turned on and operated for about 5 minutes then stopped, Any Idea why???. That style of compressor does create quite a bit more drag when running, but still would only run for a very short time in colder weather. Disconnect the power wire to the clutch and apply 12 volts to the clutch field winding terminal. If the clutch engages but the compressor does not turn (the belt will start to slip and squeal), the compressor is locked up and you need a new compressor. Edited July 14, 2011 by Dogbone. Inspect the clutch located at the front of the AC compressor and make sure the clutch rotates freely. The Auto Air Conditioner Controller puts another switch in after that, one that turns off the compressor at high throttle angles. It’s not the fact that your air conditioning system is cycling that is a problem, but the frequency that indicates problems. I have a 1997 Saturn SC2. If it shuts off them, test the socket for trigger ground coming from the PCM to energize it. Most systems has a high pressure and a low pressure switch that will turn off the compressor. If there wasn't enough in the system, it wouldn't even do that. Conversely, when the electromagnet device or the a/c compressor clutch coil is turned off, the friction plates will spring apart in effect. If the noise is there with the AC off, the problem is not likely to be in the compressor/clutch assembly, since with the AC off, only the pulley and its bearing is moving, and with the AC on, the pulley and bearing is rotating as a unit with the compressor crankshaft, so there is no relative motion. RE: AC compressor cycling IP: Logged Message: Guy's Thanks for the responses, we will do anything to try and improve mileage. Figure out what’s wrong with your car’s A/C and fix the problem yourself, all for less than the diagnosis alone would cost at most auto repair shops. Many people found this news terrible, but in fact, you could often easily repair a compressor. Should I just bear with the noise until the charge is higher? I don't want to ruin the compressor, so I just turned the ac off and came here for advice. You may feel more resistance on some parts of the rotation, but you should not feel any grinding or grittiness. If it shuts off them, test the socket for trigger ground coming from the PCM to energize it. I then removed the under-hood fuse & relay cover and "tapped" on the relay that controls the A/C compressor clutch with my fingers. A quick way to confirm compressor clutch failure is to manually turn the AC on and off. What could be causing this and how do I fix it?. If the ac clutch does not engage during the ipdm test then most likely you have an electrical problem. An AC compressor contains a motor with start and run windings. He installed the clutch for free and somehow the wire ended up wrapped AROUND the compressor shaft and shorted out there AND at the magnet connection. Sometimes the clutch itself can be. The AirCon can switch itself on and off intermitantly when you have a faulty resistor pack/thermostat, faulty track on your Accelerator position switch, faulty Hot-Cold control, faulty system pressure switches, compressor clutch, or associated relays and wiring. Since the clutch engages, there is enough refrigerant in the system (pressure) for the clutch to engage.