I shut it off to keep from ruining the whole mess. The pulley bolts in place of your compressor to retain your belt routing, but the belt only spins the pulley rather than powering the faulty compressor. Removing the electrical connector will keep the A/C clutch from engaging regardless of how you have the HVAC panel setup inside. I turned it on high thinking maybe the light is burnt out, but nothing checked the compressor to see if maybe spinning regardless of the light and nope. BMW A/C Belt replacement Procedure The ac belt on your car is a strech belt with no belt tensioner. AC compressor pulley seizes intermittently it will be difficult for the belt to get the compressor to start to spin. Bad AC Compressor Symptoms. It’s for this reason that compressor problems are not unheard of even on the most prestigious cars. if the ac compressor pulley is not turning could that be related to the alternator going out 1 Answer. Clutch will not engage. Take a peice of rope or string wrap it around all the other pully. There was a line of oil on the frame inline with the rear of the AC pulley and a hissing noise. A new compressor is $200 + the shipping. There is an electric magnet clutch, that when the AC is turned on, the magnet engages and the center of the compressor pulley will now be spinning. Receiver does not hold pressure when compressor shuts off: 1. He was going to scrap them so I confiscated them. AC pulley does not turn whether AC is turne on or off, AC pulley does not spin This may require special tools, and compressor removal, and has to be done. The ac clutch pulley bearing is inside the pulley, not inside the compressor. The clutch is mounted on the front of the pulley to engage the compressor as it cycles. Can’t afford to have the compressor replaced. My Heat Pump Fan Is Not Spinning Pull the bad belt off the blower pulley, then remove it from the motor pulley. The AC compressor pulley will be held firmly in place by the compression inside. Today is the first time I've started it since then and it appears the AC compressor has seized. 4) The AC clutch and pulley assemblies are as follows: 5) Remove clutch center bolt using the clutch tool as follows. The free-rotating pulley and non-energized clutch coil stop compressor operation. When the compressor clutch is not engaged, the input shaft of the compressor does not spin and the drive pulley freewheels on a sealed bearing assembly. Your air conditioning is a stupid system, really it is. Go to a junk yard and fond a compressor that you can spin by hand (ensure that you are spinning the compressor and not clutch assy). AC compressor has an internal problem and sticks/is tight to get going. burning belt /ac compressor pulley stuck after some research I concluded that the only thing that could have happened in this case is that the pulley on the ac compressor for some reason froze causing belt to continue spinning. When the system is activated, electrical current passes through an electromagnetic coil mounted behind the pulley. take a 10 or 12mm socket and remove the center nut on compressor pulley. I checked the single wire to the the AC compressor, and it gets the 14v signal when the AC is switched on. when turning the ac on and off. Since I had the alternator out, it was much easier to spin the a/c pulley by hand, even though it was still tight to get my hand there. Well, the pulley always spins, but the compressor does not. The pulley has no wobbles or restriction of movement as it spins freely. My Air Conditioner Compressor Is Not Kicking On. BMW A/C Belt replacement Procedure The ac belt on your car is a strech belt with no belt tensioner. It should be difficult but move. So, lemme see if I understand. Will low refrigerant level cause the AC compressor clutch to not engage 15 Answers. Examining Air Conditioning Clutch Failures in the Field This guide can be used as a reference to diagnose clutch failures, and is specifically designed to help you differentiate between unwarrantable clutch failures and those that would normally fall under possible warranty consideration. Then the pulley is connected to and rotates the compressor. The compressor's clutch also may not engage and will just stay cycled off all the time. Clutch is not spinning. So that the compressor is not always turning, there is a magnetically operated clutch between the pulley and the compressor. There are a few symptoms you can look out for to know when you have a failing AC compressor. The pulley turns whenever the engine is running, although the compressor clutch is not engaged when the air conditioning is turned off. : The air conditioning in my Wife's car stopped working yesterday and by listening to the engine when engaging the AC button, the compressor didn't come on. The ac/heater fuse is not blown. Doesn't take long to destroy the belt from friction. Air conditioner compressor unit diagnosis & repair guide: This article discusses the outdoor components of air conditioners and heat pumps: how the air conditioning compressor-condenser unit works; the detection of defects in air conditioning compressor and condensing units, including evaluation of air conditioner compressor noises, hard starting, lost cooling capacity, and detection of a. So today the compressor clutch pulley bearing started smoking and making all sorts of nasty noises! I was fortunate to have been able to shutdown the engine before it burned the belt or destroyed any additional parts! The repair took about an hour and a half and the bearing was about $25. I'm a little hard of hearing, but finally realized what she was talking about is coming from the pulley area on front of AC Compressor. If the previous owner went through the trouble of making sure the belt wouldn't go around the air conditioning compressor I would guess that the compressor pulley no longer spins. In some cases, an idler pulley will be used to replace an accessory that is not present, such as an air conditioning compressor. Start by wedging the clutch hub so it can not rotate. The sound seems to be coming from the right side of the compressor. Note the level of cooling as well. slide out clutch and be sure not to lose the spacers. So, lemme see if I understand. I'm nearly certain it is the AC compressor clutch & pulley mechanism (Toyota part no. Brand new bearings do not spin freely. The AC compressor clutch has a free-spinning outer pulley. It is not the the sound of clicking when the compressor is turning on. The pulley itself spins the whole time, because the engine is spinning it, obviously. - Angle the compressor to access the bolt on the front. The motor turns a piston that compresses the system's refrigerant. 8 659958011 659958011 94777204,Auto Air Conditioning Compressor,Auto A/c Compressor For Chevrolet Cobalt / Spin 1. My 2005 Bounder with 8. So, Where to begin? It wasn't difficult to spin the compressor pulley by hand. Also, in defrost mode the ac is on. Comments: On 2006 ML500, I've ended up with broken pulley on the AC compressor; long story. This was probably the easiest part. DIY clutch bearing replacement is on trailvoy. if the ac compressor pulley is not turning could that be related to the alternator going out 1 Answer. That was a month ago. This happened 135 miles from home and removing the belt also stops the power steering!. If it's the compressor making the noise and not the pulley/clutch, that should work. 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. Eventually the clutch shaft actualy failed and i had to remove the drive belt to be able to drive home. Any suggestions. AC Compressor Not Turning On During inspection I noticed the AC was not working. So, your compressor. There should be no noise from it at that time. Can anyone think of anything shy of pulling this goddamn compressor?. You will see the belt and the outer pulley turning, but the front face area of the compressor clutch assembly is not turning (the area inside the outer pulley). He says "they don't do. Ford had a genius idea to install a sensor in the top of the evaporator case. But my guess is that you are seeing the pulley spin and thinking the entire compressor is spinning, which it does not, until you activate the a/c system. The center part on the pulley of the A/C compressor will not spin when you have the air conditioner off or if there is a problem. If the compressor engages, the problem is probably low pressure. Take a look at the front of the compressor clutch to see whether it as well as the pulley are spinning or not. i check the wire they go to ac compressor and it 14 v in their so it is not form ac rely or electrical problem. If your pulley isn't spinning I'm thinking a bearing has failed. It is a single wire to the back of the pulley. When current is passed through, it creates a strong magnetic field that pulls a splined hub into contact with the spinning pulley. Plan to do this on a relatively warm day. The pulley itself spins the whole time, because the engine is spinning it, obviously. It has been like this since I bought the car in 2011 and the noise has not gotten any louder over the past two years. When an air conditioner begins to fail, the most common thought is that the AC needs a refrigerant recharge. Removing the electrical connector will keep the A/C clutch from engaging regardless of how you have the HVAC panel setup inside. If you would do a simple jumper wire test on the clutch, chances are it is still reacting. Oil Catch Can fit Hilux Triton MQ GU GQ Patrol ZD30 NAVARA D40 4WD Turbo Diesel. If the pulley does not spin free all the time then your compressor bearing could be wearing out. When it doesn't work there are a few basic steps to take to figure out why it's not working. Frustrated with ac! compressor hub turning slow SOLVED! Getting pretty frustrated! I have a 93, had it abt 2. Have an assistant turn on the AC controls to maximum. I ordered an AC clutch, around $80 to $90, pulled the old clutch, not TOO difficult. When I turn on the ac then the sound disappears as the fans turn on, however, even with the ac still on, the sound reappears when the fans stop spinning. This in turn engages the drive pulley to the compressor input shaft, causing the shaft to spin. Same situation today with my 2006 ML350, bought 2yrs ago CPO from dealer and added a Mercedes extended warratny to 100k miles. " "i check the hi side and the low side pressure. Stop in an auto parts store and ask for any bearing to compare it with. Has anyone else had this problem? Can I fix it without replacing the whole compressor?. 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. The question is, Can the R134 compressor be converted to be used with R12 refrigerant. 1 Chevy Workhorse was blowing hot air from dash unit, also making squealing noise. Constant with the RPM's from idle up. However, in most cases, the problem is not really caused by clutch itself. i check the wire they go to ac compressor and it 14 v in their so it is not form ac rely or electrical problem. Shouldnt they be hot and cold if there is refrigerant in the system. com Forums. An A/C compressor bypass pulley is a quick fix to quiet a car or truck's noisy A/C compressor. When the A/C is off, the outer pulley turns with the belt, but the compressor does not turn. The problem is that many mechanics spin a compressor to check for proper function before installing. RE: AC Compressor Clutch/Pulley replacement IP: Logged Message: When the AC is on, everything in front of the pump becomes one solid part of the rotating shaft. Does anyone have any experience with these? It seems the compressor shuts off at higher rpms but it continues to cycle. I disconnected the ac power feed wire and everything went back to normal. If you can see the pulley turning, but the hub of the compressor is not turning (like a traditional compressor would appear with the clutch disengaged), then maybe the break-away pulley has broken away. SYMPTOM SUMMARY The air conditioning system is not cooling as expected. Eventually the clutch shaft actualy failed and i had to remove the drive belt to be able to drive home. Thanks, July 26, 2018 : Followup from the Pelican Staff: No. Ford had a genius idea to install a sensor in the top of the evaporator case. The compressor can wear out and require replacement; this can take the average backyard mechanic about an hour to complete. If you would do a simple jumper wire test on the clutch, chances are it is still reacting. 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. The compressor's clutch also may not engage and will just stay cycled off all the time. Stand in front of the AC compressor at the front of the engine. Probably the easiest thing to do is locate the appropriate relay and pull it. At first I thought it was the tension pulley but I replaced that today and the sound is still there. 3) Confirm noisy bearing by spinning pulley as show in video above. Both the pulley and the clutch should be spinning. As long as the clutch is staying engaged and not slipping the voltage it should not be causing the problem. The pulley is belt-driven by one or two V-belts directly from the engine's crankshaft or by a multi-ribbed V belt or serpentine belt. Checked the fuse and it is good. His wife's recently purchased, used, 2012 Jeep Wrangler Sport Unlimited 4 Door started smoking from under the hood. So today the compressor clutch pulley bearing started smoking and making all sorts of nasty noises! I was fortunate to have been able to shutdown the engine before it burned the belt or destroyed any additional parts! The repair took about an hour and a half and the bearing was about $25. My landcruiser s AC compressor had bearing problem. Have someone in the truck start it while you observe the clutch/compressor (make sure A/C is off when you start it). The pulley will, of course be spinning, but the circular assembly mounted to the front of the pulley will spin with the pulley only when the compressor is engaged. Example of Properly Running Car Air Conditioning Compressor - A/C Pro This clip shows a properly running car compressor. 88410-33150), which would be good news if that's all it is. However i know on certain vehicles you can buy a pulley bracket to bolt where the A/C compressor would sit/ and or get a shorter belt. While we were discussing what to do with my son's Ram truck with a case of the death wobbles, he had another car problem. A/C compressor pulley or bearing died, how can I tell which? With the key off, the ac compressor pulley should spin freely. It is an ominous sign when the clutch engages but the compressor does not spin. So, Where to begin? It wasn't difficult to spin the compressor pulley by hand. Install it and have it properly serviced. To tell the a/c is on. However, once installed the vehicle will no longer have air conditioning. 5 V with the. A drive belt connected to a crankshaft pulley turns the AC compressor pulley, which is mounted on the end of the compressor. So start your diagnosis by determining if the compressor clutch works. Check fuses, relays, and wiring. I bought a new one and installed it, but it isn't turning the compressor when engaged. I'm nearly certain it is the AC compressor clutch & pulley mechanism (Toyota part no. If thats what you are refering to then make the belt is there and spinning. I was under the impression that the pulley could be pulled off and replaced, but a local mechanic is telling me that it needs a whole new compressor because it's all one assembly. Turn the air conditioning controls to MAX AC and start the engine. It’s for this reason that compressor problems are not unheard of even on the most prestigious cars. There should be a belt on the compressor's clutch pulley. The free-rotating pulley and non-energized clutch coil stop compressor operation. When an air conditioner begins to fail, the most common thought is that the AC needs a refrigerant recharge. 5 years, its been great. Any time there is a problem with the AC you should always make sure the clutch is moving. He was going to scrap them so I confiscated them. If it does not, shut the engine off and disconnect the negative battery cable with a socket. I think my pulley continued to spin though. It may appear to be manual but it is an Auto temp control system controlled by the Body control Computer. - Remove the clutch 6. (l) Install the compressor drive belt to the pulleys as shown in the left figure. It did not sound bad, but then I took a string, wrapped it around the pulley, and got the pulley to spin fast (like a yo-yo). I suspect it is turning. Air Conditioning pulley not spinning ? MK7 58 Plate If you want to check the compressor actually works, bridge out the AC pressure switch with a jumper wire or. V-BELT DRIVING. What is an AC clutch compressor. Whether or not this is the cause of the problem, it’s a good early remedy to try. The most obvious symptom is when the air conditioner does not blow out cold air anymore. Shop says ac compressor is causing my belt squeal but idk if it’s the clutch or compressor or pulley bearing. An A/C delete/bypass pulley for your application would be a way to go, but it will involve pulling the compressor. When the A/C is off, the outer pulley turns with the belt, but the compressor does not turn. if the ac compressor pulley is not turning could that be related to the alternator going out 1 Answer. Stop in an auto parts store and ask for any bearing to compare it with. The center of this clutch should be spinning when the compressor cycles on. I think my pulley continued to spin though. Clutch is not spinning. Welcome: I take it that it's now retrofitted to 134a not totally a problem at all. Your car probably has a serpentine belt which is a continuous belt used to drive multiple peripheral devices. When the compressor clutch is not engaged, the input shaft of the compressor does not spin and the drive pulley freewheels on a sealed bearing assembly. When the A/C is activated, the compressor clutch transfers power from the engine's crankshaft to the pulley mounted on the A/C compressor. Stand in front of the AC compressor at the front of the engine. 6 with 150000 miles. The pulley is always turning when the belt is moving. His wife's recently purchased, used, 2012 Jeep Wrangler Sport Unlimited 4 Door started smoking from under the hood. The squeal may mean you need to replace the belt (the cheapest solution) or your idler pulley is going bad and not keeping enough tension on the belt when the a/c clutch engages (causing the squeal). I ordered an AC clutch, around $80 to $90, pulled the old clutch, not TOO difficult. Whether it's a full-size unit or a window AC compressor not turning on, Repair Clinic can help you reach your optimal air temperature for comfortable habitation. A freshly packed bearing is actually nice and tight and should not wwwheeeeeee when you spin it. Pulley out of alignment. There was a line of oil on the frame inline with the rear of the AC pulley and a hissing noise. When the AC is turned on, the clutch disc on the front of the pulley is pulled into the face of the pulley which is still spinning with the bearing. If it did not then you would have a toasted belt. On the advice of others in Tacoma World, I chose to replace the entire mag clutch, not the compressor, and so far so good. At first I thought it was the tension pulley but I replaced that today and the sound is still there. It is not the the sound of clicking when the compressor is turning on. SL55 AMG (R230) - Noisy bottom Pulley (Air Conditioning Compressor?) Discussion in ' Engine, Drivetrain, Fuel and Exhaust ' started by C A R S E , May 6, 2016. When i got home i looked at the engine with the AC off and everything is spinning fine except the AC of course, all the pulleys are moving fine, no issues what so ever. Once you turn on the AC the center part of the compressor, the AC clutch should engage and start to rotate with the pulley. The Compressor pulley will spin free when the clutch is not engaged. When the AC is turned on, the clutch should engage to the pulley and the AC compressor should turn, and yes, it can cause the engine to vibrate a little. In order to get to the ac compressor i reomoved my air. I bought a new one and installed it, but it isn't turning the compressor when engaged. The compressor has a plastic break-away pulley to protect the drive belt if the compressor should lock up. The AC compressor continued to turn even after I pulled the 12-volt supply wire to the unit. This problem happened after I adjusted the belt due to a bit of squeeking. Hi all, I am still at it. What is an AC clutch compressor. The pulley has no wobbles or restriction of movement as it spins freely. You will see the belt and the outer pulley turning, but the front face area of the compressor clutch assembly is not turning (the area inside the outer pulley). The AC compressor clutch has a free-spinning outer pulley. So the culprit is the clutch pulley thing, which can be bought separately from the whole compressor itself. The clutch consists of a coil, a free wheeling pulley driven y the serpentine belt, and a pressure plate mounted on the end of the compressor shaft. So, Where to begin? It wasn't difficult to spin the compressor pulley by hand. to/2Lxnmen I forgot to add the actual whole AC compressor could be locked up as in the AC compressor shaft is frozen. I at first thought a battery problem but after cleaning, charging, and testing it the battery is fine. I am by no means a mechanic at all but this task isn't too hard. The Sanden compressor is equipped with a serpentine pulley which of course we are not going to use now. is there a relay associated with clutch,where is it located? WHAT ELSE SHOULD I C Ac compressor clutch not turning no cold air - Nissanhelp. Ugh, my A/C compressor pulley seized up this morning I tried disconnecting power to the compressor to disengage the clutch, but it still doesn't spin. You can tell if your compressor is cycling on and off by looking at the clutch (or belt pulley) at the front of the compressor. When current is passed through, it creates a strong magnetic field that pulls a splined hub into contact with the spinning pulley. other than as a pulley for the serpentine belt to spin on. The pulley and clutch can spin by hand. The AC compressor has to spin for the system to work. The AC compressor has to spin for the system to work. The plate on the outside of your comp is called a compressor clutch, it's run off of an electro magnet, when it turns on the clutch stops free spinning and snaps to the pully, at this point (after turning your ac on) does it stop making the noise?. If only the pulley rotates, there must be an issue in the system. By passing the ac is pretty common, and it will not hurt anything. My two thoughts are air gap or low pressure even though I've pumped it full according to my ac pro gauge. I assume that leaking freon. Compressor not turning. Third, the A/C compressor relay is a $4 throwaway part, like the fuel pump relay. So the pully spins fine, that's not much of a surprise. As the swash plate rotates, the friction. The AC Compressor is driven by a belt attached to the engine. Plan to do this on a relatively warm day. Hi all, I am still at it. The A/C contractor I worked for back in the '70s had just changed out a York machine with not one but two of these compressors on them. It may start spinning after a while, or it. When the compressor clutch is not engaged, the input shaft of the compressor does not spin and the drive pulley freewheels on a sealed bearing assembly. The squeal may mean you need to replace the belt (the cheapest solution) or your idler pulley is going bad and not keeping enough tension on the belt when the a/c clutch engages (causing the squeal). We put it into a shop, they said ac compressor was bad, clutch about to fall off, and all pulleys were bad, they changed compressor, all pulleys and belt for $1800. The serpentine belt has both a tensioner and an idler pulley. If your compressor is not turning on, or not turning off, the problem may be with your clutch or clutch brushes. But, watch for the belt slipping on the pulley as the cause of the compressor not turning. But first, know some facts about an AC clutch compressor. I ordered an AC clutch, around $80 to $90, pulled the old clutch, not TOO difficult. If you can see the pulley turning, but the hub of the compressor is not turning (like a traditional compressor would appear with the clutch disengaged), then maybe the break-away pulley has broken away. I ran across this thread by. However, once installed the vehicle will no longer have air conditioning. Motor running, AC on max, fan on high. If the noise is not coming from the bolt/pulley, follow Work Shop Manual (WSM), Section 303-05B to diagnose. The compressor clutch allows the spinning pulley on the front of the compressor to engage and disengage the AC compressor so that it’s only running when it needs to be. So - if you didn't compromise the face seals when doing the bearing repack - you are probably fine. As long as the clutch is staying engaged and not slipping the voltage it should not be causing the problem. If you're able to push the connection down, it seems like your using the quick connect fitting properly. Same situation today with my 2006 ML350, bought 2yrs ago CPO from dealer and added a Mercedes extended warratny to 100k miles. Seems after a few months of trouble free motoring, the warm weather is coming back and my AC does not work. If it is not spinning it is either low on refrigerant, not getting power to the compressor or the belt is not causing the compressor pulley to. Air conditioner compressor unit diagnosis & repair guide: This article discusses the outdoor components of air conditioners and heat pumps: how the air conditioning compressor-condenser unit works; the detection of defects in air conditioning compressor and condensing units, including evaluation of air conditioner compressor noises, hard starting, lost cooling capacity, and detection of a. Grab the CLUTCH and try turning that. The sound seems to be coming from the right side of the compressor. Your AC compressor should spin freely without the AC clutch engaged, for example with the defrost and A/C switches turned off. The belt was slipping over it and burning up. The Honda Accord uses an optional air-conditioning system to lower the temperature inside the car; the system has a condenser, evaporator and compressor that circulate Freon through a channeled blower fan. Spinning the AC compressor pump pulley makes all kinds of metal on metal noise. 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. A bad AC compressor clutch needs immediate fixing. My sons 01 V70 compressor seized out of the blue. Of course, before you even swap belts, try unplugging the AC compressor. Also, both of the ac lines are just at an ambient temperature (neither hot nor cold). Replied by dreamer2355 on topic A/C compressor not turning Did you try to free-wheel all the pulleys to see if you have any issues there apart from the Ac/C compressor? I would also check for belt alignment. The Bearing stops turning as a "bearing" once the AC Clutch is engaged because the Pulley and AC Input shaft are now locked together and turning at the same speed, hence the bearing is no longer spinning as inner and outer halves, and as such it can't make noise whether it is good or bad. take a 10 or 12mm socket and remove the center nut on compressor pulley. Third, the A/C compressor relay is a $4 throwaway part, like the fuel pump relay. When the familiar hum of your Charlotte, NC home's air conditioner is interrupted by unfamiliar noises, it's a good idea to be concerned. The AC blows cold air. Wait for the AC clutch in front of the compressor body to engage and spin. My Air Conditioner Compressor Is Not Kicking On. This in turn engages the drive pulley to the compressor input shaft, causing the shaft to spin. 3) Confirm noisy bearing by spinning pulley as show in video above. The compressor's clutch also may not engage and will just stay cycled off all the time. take a 10 or 12mm socket and remove the center nut on compressor pulley. Any suggestions. Put some good loctite on the 10mm screw (mine actually came out and the pulley disapeered completely!). You will see the belt and the outer pulley turning, but the front face area of the compressor clutch assembly is not turning (the area inside the outer pulley). Belt squealing when AC starts. Example of Properly Running Car Air Conditioning Compressor - A/C Pro This clip shows a properly running car compressor. manufacturer will not approve defect credit without a work order showing flush, receiver dryer, expansion valve or orifice tube and pag oil. The clutch not being able to be spun by hand has caught more than one experienced mechanic off guard. Then start the engine with your AC heater controls OFF, and the outside of the pulley will be turning but not the triangular inner part. when turning the ac on and off. When the air conditioning is turned on inside the vehicle the compressor clutch will engage and begin to spin with all of the other pulleys. I’m extremely low on Freon and suspect that’s the cause. With air conditioning compressor bypass pulleys from 1A Auto, you can move the compressor aside, bolt the pulley in place and continue using your original serpentine belt. Yes, the clutch does not move "normally" until the a/c is activated and then it does spin with the pulley. Bleed tank! Disassemble check valve assembly, clean or replace faulty parts. Does the ac compressor supposed to spin than stop? In a nut shell NO, Automotive AC compressors should not cycle on & off, (inner part on the compressor pulley) engages (Spins with pulley. now when you click the AC button on, it looks the exact same, no difference, the pulleys all spin, but the front of the AC compressor does not Spin, at all but the pulley does. The clutch consists of a coil, a free wheeling pulley driven y the serpentine belt, and a pressure plate mounted on the end of the compressor shaft. The compressor has a plastic break-away pulley to protect the drive belt if the compressor should lock up. Check fuses, relays, and wiring. It is designed in such a way that during catastrophic compressor failure and compressor crankshaft lock-up or damage the pulley will be able to rotate freely on its internal bearing and the car could be taken to a safe place for service. Here are some of the more common types and causes of A/C compressor noise. It sounds like the compressor locked up, but it could be the clutch and pulley have definitely come apart. I used a broomstick to listen and it appears to be coming from the compressor pulley spinning. This is also a great alternative for an older car that still runs great but is suffering air conditioner problems as well. The reasons would be due to bad clutch oil, poor ground, low-pressure lockout, a blown fuse or open wire in the oil. Can you get the clutch and pulley off? If you can then try to spin the compressor again. I have an '09 Limited with 175k miles that developed a new sound last fall when turning on the AC. AC compressor noisy - need help for AC gurus #804900 01/07/07 06:36 AM: so when the clutch is off the bearing is spinning (pulley spins but shaft is not), but. There should be no noise from it at that time. If the A/C is off the engine will not have any strain on it from the Compressor. Fixing - Answered by a verified Subaru Mechanic We use cookies to give you the best possible experience on our website. I checked the air gap and it is within spec. Background. Ok I just checked and the center of the pulley with the 4 bolts does not spin when the AC is turned off nor do I hear the ticking sound When I turn the AC on however the the center part of the Compressor with the 4 bolts starts to spin and that is when the loud clicking noise starts and it coming from the compressor pulley. Check fuses, relays, and wiring. If the pulley does not spin free all the time then your compressor bearing could be wearing out. The AC pulley should be spinning continuously by the V belt. ac compressor pulley won't turn when i turn the a/c on, the compressor pulley (or whatever it's called) is wanting to turn but it's just not turning. Most systems has a high pressure and a low pressure switch that will turn off the compressor. Red powdery stuff on ac compressor? right above that a/c pulley. Can you get the clutch and pulley off? If you can then try to spin the compressor again. Checked freon and it was still charged. (l) Install the compressor drive belt to the pulleys as shown in the left figure. Something loose or sound like it going bad? Sent from my iPhone using Tapatalk. If it won't, or at least not smoothly, then the compressor grenaded inside which means that you'll have metal fragments throughout your system. A/C failure: Clutch or compressor? the outer pulley driven by. Go to a junk yard and fond a compressor that you can spin by hand (ensure that you are spinning the compressor and not clutch assy). Not sure what would cause the pulley to do this.