The armature plate and hub assembly are fastened to the compressor drive shaft. No 12 volts at comp plug. 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. I also tried jumping it at the ac relay but still a no go. These vehicles use one or more switches as part of the logic that determines if the compressor clutch should turn on when the driver commands the A/C on through the control head. A few questions i am hoping someone more experienced with this can answer. The compressor clutch is not engaging when the AC is turned on so the rpm doesn't change. Rotate the compressor clutch be hand to see if it is loose. The pressures developed will slowly fall off, leading to not so cold air. Also be sure not to overlook the obvious, like a loose. While the clutch pulley turns whenever the engine is on, the compressor only activates when AC (and in some cases defrost) is in use. on this setting,the compressor would run all the time. I do have power at terminal 86 on ac clutch relay. No compressor engagement with 2 of them. Compressor doesn't turn on. Yes, it is easy to blame a mechanical system but your car's compressor system is engaged by the clutch and that, in turn, is driven by the ECU (electronic control unit) for. Step 4: Inspect the clutch located at the front of the AC compressor and make sure the clutch rotates freely. Start Relays – As with the capacitor, the HVAC technician may try replacing the start relay, which is the only surefire way to determine whether it’s working right or not. We'll see, I'm scheduled for tomorrow. No, the compressor clutch does not engage when I turn on the AC switch. Compressor not turning - but can turn by hand. Probably your compressor is not turning on because there are protections built in to the system to protect it. The clutch without power is suppose to spin or turn when turning it by hand. when i replaced the relay it still didn't work. Any suggestion will be appreciate. I read somewhere in the Mastercool manual that some compressors can be turned by hand and some need to be mounted in a jig and a wrench used to rotate it. compressor’s shaft 10-15 times by hand to. Go ahead and clean your condenser coils, replace or wash your filters and make sure the supply vents are clear of blockages. 4 a/c clutch not engaging With the car running and the a/c switch on max the compressor does not engage. I did not put in the rest of the can. When the compressor is not coming on, your air conditioner unit will not run properly. I just installed a Vintage Air Gen IV system in my car with a Sanden compressor and March serpentine belt pulley set-up. When you turn your air conditioning on, the A/C compressor clutch is the first part to move. A few questions i am hoping someone more experienced with this can answer. Anyway, I jumped the 12V feed and te compressor lines and the compressor clutch worked. My retired H+A friend stopped by yesterday and took a very quick peek said that I should jump the positive wire coming off the compressor to the battery. A/C compressor clutch not engaging switch rigged up to directly turn the compressor on, just to make sure everything works, and I'm having no problems with any. Concerning the ACCcontrol module , the "bad order may comme from the front defrost position failing because when on that position the AC is running but the light on the AC switch is not lighted ???? Its the same as when the AC switch is off and that the clutch stay engaged. Since the compressor is not engaging, the air is not cold, has to be electrical but all the control lights are ok, no blinking lights or anything abnormal, the blower is fine at all speeds, just. Troubleshooting a Car's AC Compressor Clutch. Note: this is not the pulley, but the center piece that engages the pulley to the compressor shaft. Then sprayed the clutch ac compressor and the noise went down. The pressures developed will slowly fall off, leading to not so cold air. I hooked a pressure gauge up to the low side port and it has 25PSI, which is at the low end of the "Safe" zone on my guage. All other systems in the car work perfectly. Power to both and correct Ohms to both. If the compressor is not engaged, the reason must be found before. These vehicles use one or more switches as part of the logic that determines if the compressor clutch should turn on when the driver commands the A/C on through the control head. i need help with my ac it died out couple days ago it was working fine but i no longer hear the compressor kicking on when i press the button for a/c i was told there is no power going to the compressor and that i should look into changing the relay only thing is i dont know where its at nor what it looks like. The AC cooling fans come on and stays on (is that normal?) However, I am not hearing the clutch engaging. When the drain is working correctly you'll see a good amount of water dripping onto the pavement under the vehicle after you park. I have checked at the relay, and it is not getting power (i. But the ckutch is not engaging, nor is the compressor turning. What does this mean to the owners of the Fusion? I should start by saying there are many reasons why your car's A/C can stop working. Dealer would not even give an estimate for repair. Has any one had this problem?. In summary: Problem: AC Stopped working Symptoms: Compressor Clutch not engaging, Large cooling fan not operating, low voltage to the compressor clutch Solutions: Replace FCM ($25 Ebay), Large cooling fan ($75), compressor clutch ($120 Ebay). Whether it is the compressor, the coolant or the oil, you have to keep a watchful eye on all of them and try not to test too much on your own. hi in my 2008 altima 2. In both cases it's possible that the ECM is shutting off the clutch immediately after it's activated because the clutch isn't engaging properly. No power at compressor. What is the Fan Clutch? The fan clutch is a coupling device that is located between the water pump shaft and the fan. If the ac clutch does not engage during the ipdm test then most likely you have an electrical problem. Power to both and correct Ohms to both. Started it up and the compressor did not turn when the clutch engaged. Install shaft key and clutch plate. AC compressor clutch will not turn on. 15amp under dash is fine. I couldn't 'spin' it or anything. No radiator fans come on when I turn on my AC switch. They're clearly marked. com/public/mz47/ecb. Sounds like the clutch is faulty, although per the wiring diagram I have there is a thermal overload on the compressor that is wired in series with the clutch so that could be a problem, but either way it looks like I'm going to have to pull the compressor. It read open across all 4 pins. I checked and I had ~14v to the clutch. Check clutch air gap 1. A good electrical side is shown by a compressor clutch that is turning. The AC works fine and the clutch does not appear to slip. I'm nearly certain it is the AC compressor clutch & pulley mechanism (Toyota part no. Here is a list of what I have checked; 1: Refrigerant pressures. 02 H6 subi - When I turn the A/C on the car does nothing different than if jsut the fan is blowing, that is the engine does NOT bog down aka the compressor and blower do not seem to engage, no lag on the motor. Once the AC clutch obviously disengages itself and begins blowing warm air, turn off the AC with the button on the center console. The front clutch will be hard to spin but if you spin the actual pulley where the belt rides it should spin free. i need help with my ac it died out couple days ago it was working fine but i no longer hear the compressor kicking on when i press the button for a/c i was told there is no power going to the compressor and that i should look into changing the relay only thing is i dont know where its at nor what it looks like. In case there is any problem with the AC compressor, your car’s AC will not deliver cold air and may even cause the engine to seize if the compressor gets stuck. A faulty automotive air conditioner can be one of the more difficult issues to diagnose and repair. My AC is blowing only warm air. The first step is to inspect the compressor with the engine running, and the system turned on. i need help with my ac it died out couple days ago it was working fine but i no longer hear the compressor kicking on when i press the button for a/c i was told there is no power going to the compressor and that i should look into changing the relay only thing is i dont know where its at nor what it looks like. If the compressor clutch does not engage, turn off the engine. In some cases, a fuse would be blown or a breaker would be tripped. I also tried jumping it at the ac relay but still a no go. I have the same problem with mine, the compressor clutch on mine I think as it wont turn when pushed by hand either so may have siezed, bit of good info here though. r134 converted, full of freon. I do have power at terminal 86 on ac clutch relay. If the ac clutch does not engage during the ipdm test then most likely you have an electrical problem. On the Santa Fe the clutch will not turn even without power. If it fixes it, replace the relay. Yes, the clutch does not move "normally" until the a/c is activated and then it does spin with the pulley. 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. I checked up to the AC relay and the AC relay is getting power. The compressor is the very beating heart of your car air conditioning system. Has any one had this problem?. I will take the advice of going to the AC guru since I do not have the proper tools for AC work. Wet carpeting on hot, humid days can indicate a clogged air conditioner drain. One thing I did notice, which I'm suspicious of and not sure if its normal on this AC compressor, but the clutch plate is a good 2-3 inches away from the front of the compressor and I can clearly see that length on the shaft that the clutch plate is attached to. " If you start out with. 103000 mi: Air conditioner compressor locked up sending metal through system for the second time. There is a relay that turns on the AC clutch. com/public/mz47/ecb. Hence, it is necessary to select the optimum size of the air conditioner to ensure an optimum cycle time. No 12 volts at comp plug. It will only allow you to engage th ac compressor clutch. YourMechanic. When I turn the AC on, the RPM's go up for a second as if the system is about to start but then the RPM's go back down and the AC light starts flashing. The thing is that my AC clutch will always engage when engine is cold but will shut off about 15-20 after. There are several reasons why your car's air conditioning can fail, but one culprit is the A/C compressor. This gap can be tightened up by removing a shim between the compressor and clutch. There are 3 things that you should check, in a specific order, to narrow down the problem. 020" gap around about half of the clutch and about 0. Put a test lamp at HP switch, got current on one side. Check clutch air gap 1. got it for 150 so it wasn't bad. There are 3 things that you should check, in a specific order, to narrow down the problem. Although it's not a permanent solution, it remains one of the fastest ways to test it out. 4: Compressors - Amazon. If not, that switch needs to be replaced. Related Article: What Should You Do When Your Car AC Compressor Not Turning On?. I set the compressor up on the clutch end, thinking that the oil will lube the seal on the inside and no squeak but it's still tight. If the AC compressor fan clutch is not turning then it could be completely out of freon due to a leak… Can the ac clutch on a 97 Monte Carlo z34 be replaced or do you have to replace the whole. Could I fix this by hiring a guy to just rebuild my ac compressor clutch, or do I really need a new compressor? Is $1700 a rip off for a new compressor? Thanks for all the help. when i replaced the relay it still didn't work. C on, so I know it has pressure and freon. If the air conditioning system requires substantial repairs, you may not have. 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. See images from Volvo that show the AC clutch. I looked at the relay and it looks fine too, but then again you really can't inspect a relay. Any suggestion will be appreciate. Clutch compressor was always on thus draining the battery. In summary: Problem: AC Stopped working Symptoms: Compressor Clutch not engaging, Large cooling fan not operating, low voltage to the compressor clutch Solutions: Replace FCM ($25 Ebay), Large cooling fan ($75), compressor clutch ($120 Ebay). So, since I am going back in with an entirely new AC system, (compressor, evaporator, condenser, accumulator, and lines). One of the most common problems is that the clutch will burn or sometimes the bearings will fail. According to the wiring diagram, the green wire is continuous. In some cases, a fuse would be blown or a breaker would be tripped. Jumpering the ac clutch will not tell you anything about the health of the ac compressor. The clutch is not siezed i can spin it with my hand. If you want to by pass the relay and control for the relay, just power the clutch wire with a jumper. There should be a little resistance there but if its making your belt slip I would assume you will have a very difficult time turning it by hand which will verify your compressor. The clutch is also slotted for the key to go into. I have about 0. Hard job but with the right tools and time it can be done for $10. You are having Chevy Impala AC actuator problems or your AC is not turning on, then maybe you have a 2001 Chevy Impala AC compressor not working. Now, before I do this: am I supposed to oil the compressor or anything? The new unit (AC Delco) has some oil in it, but I'm not sure if that's supposed to be adequate, or if it's the correct oil. Hence, it is necessary to select the optimum size of the air conditioner to ensure an optimum cycle time. AC started going on and offblowing hot then cold. The Nippondenso AC clutch does not fit as tightly as the C171 so there are no threads on the inside surface opening of the clutch plate into which you would screw a removal tool. How the Corvette Air Conditioning Clutch works is relatively basic. Replied by RIDETHEREJK on topic A/C compressor not turning The belts and pulleys are fine. Test for AC Compressor Clutch Function. The clutch will not engage if insufficient A/C system pressure is not present. 5 50k the compressor not engaging when i turn on the ac. You are having Chevy Impala AC actuator problems or your AC is not turning on, then maybe you have a 2001 Chevy Impala AC compressor not working. Magnetism attracts the hub and shaft to the pulley, allowing the clutch to turn the compressor. r134 converted, full of freon. Turn teh center hub of the compressor by hand too, it should have some resistance but you should be able to turn it by hand. These vehicles use one or more switches as part of the logic that determines if the compressor clutch should turn on when the driver commands the A/C on through the control head. Last night the A/C was working fine, this morning would not engage the compressor clutch, the 10amp fuse is ok but replace it anyway with no luck. But first, know some facts about an AC clutch compressor. The AC compressor continued to turn even after I pulled the 12-volt supply wire to the unit. The clutch on the compressor is what allows the pulley to engage and disengage from engine power, so the compressor is only turning when it needs to. 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. 03 Vibe Base /Auto just broke 118k, AC always worked like a charm, until 2 weeks ago, it was working the past month before that w/o a prob and one day I get in and while driving turn on the fan, hit the AC switch and nothing. Power to both and correct Ohms to both. When finished, the air conditioner was blasting cold air. Started it up and the compressor did not turn when the clutch engaged. If the clutch engages, the clutch adjustment gap is likely ok. In both cases it's possible that the ECM is shutting off the clutch immediately after it's activated because the clutch isn't engaging properly. Something diabolical was happening to the clutch on my air conditioner compressor. Compressor Clutch 10P30B For 24V Toyota Coaster Clutch. Now, turn on the air. An air conditioning compressor creates cool air by circulating refrigerant through your AC unit. After started filling, low side gauge shot up to 98 psi and Mike closed low side gauge. I found the leak was the "o" ring between the low pressure hose and the compressor. I pulled the clutch wires and put power to the positive side, the clutch engaged or clicked. Related Article: What Should You Do When Your Car AC Compressor Not Turning On?. When the compressor came on it just began to squeal as it would slip. The typical complaint for an AC problem is the AC blows warm air. The relays are in the box under the hood on the driver's side. Most systems has a high pressure and a low pressure switch that will turn off the compressor. I couldn't 'spin' it or anything. I have a 99 F150. If the AC compressor clutch won’t engage on your late model Toyota and you find a B1479 Flow Control Circuit trouble code stored, the problem is usually a bad flow control sensor. Putting on the ac belt was the hardest part. Cracked or splitting belts can cause further damage to your AC compressor. Also you may want to add a 20 amp fuse to your wire for safety, if you have a dead short the wire your using may become hot real quick. didn't say why it was bad, but i assume its not turning the compressor on or off. I checked my AC pressure and it seems to be high enough that it should engage the clutch, but it is not. In summary: Problem: AC Stopped working Symptoms: Compressor Clutch not engaging, Large cooling fan not operating, low voltage to the compressor clutch Solutions: Replace FCM ($25 Ebay), Large cooling fan ($75), compressor clutch ($120 Ebay). The first thing you activate as soon as you press the AC button is the air compressor. Also, if the AC is running (manually engaged of course) the fans will come on as expected. Turns off when turned off. It may appear to be manual but it is an Auto temp control system controlled by the Body control Computer. 2: Exploded View Of Compressor Clutch (Bosch 6-Cylinder) Courtesy of BMW of North America, Inc. I installed a new AC compressor on the Solstice of Sorrow the other day, but haven't turned it on yet. The compressor clutch is not engaging when the AC is turned on so the rpm doesn't change. Compressor doesn't turn on. AC compressor clutch won’t engage – Toyota Fix B1479 Flow sensor and AC compressor clutch won’t engage. I also tried jumping it at the ac relay but still a no go. After checking things out, I found that the ac runs constantly & the ac clutch won't cycle off - even when turning all ac controls to "off". I have a 99 F150. I do have power at terminal 86 on ac clutch relay. In summary: Problem: AC Stopped working Symptoms: Compressor Clutch not engaging, Large cooling fan not operating, low voltage to the compressor clutch Solutions: Replace FCM ($25 Ebay), Large cooling fan ($75), compressor clutch ($120 Ebay). The serpentine belt rotate fine. This would not only cause a refrigerant leak, but the oil could cause the compressor clutch to slip. So, I'm thing the AC clutch is bad (not hearing any clicking at all) or it's engaging but the compressor is shot. This will damage the system in less than a minute, so DON'T leave the engine running if you see the clutch turning at this point in time! If it's not turning, start the air conditioning and verify the clutch has engaged the compressor. I might have problems with the radiator fans that turn on with the AC, they do now go to high speed when the AC is on. It was not turning when the AC was turned on. its my first car it runs fine but out here in chicago its getting too hot to not. If your AC won't turn off, you might not notice the irony of the situation right away. At no point does the AC clutch attempt to physically engage. There should be a little resistance there but if its making your belt slip I would assume you will have a very difficult time turning it by hand which will verify your compressor. Most likely causes are loss of freon which would prevent the compressor clutch from being engaged and operating the compressor, a lack of 12 volts being applied to the compressor clutch because the a/c compressor fuse or relay has failed, preventing the clutch from engaging the compressor, or the compressor. I disconnected the connector coming from the AC clutch to the wiring harness and probed it with a multimeter. This part is the heart of your car's air conditioning system. I read somewhere in the Mastercool manual that some compressors can be turned by hand and some need to be mounted in a jig and a wrench used to rotate it. My mother in law has an 07 sentra the ac is blowing hot air. I stopped the engine and i was able to turn it by hand, but it was difficult. A technician will test out the following parts to determine what to do when your HVAC compressor won't turn on: Capacitor; Start. I havent used a/c in years so i just wanted to try turning it on and the light on the button doesn't come on anymore. If you can turn the compressor by hand (understand that the belt pulley will turn freely with the engine if the clutch isn't engaged)… How do you know if AC relay is bad? Turn on ac and watch. Once the AC clutch obviously disengages itself and begins blowing warm air, turn off the AC with the button on the center console. Reading the low side pressure. But on the Fusion, if the A/C compressor is not turning on, you will need to change the Evaporator Discharge Air Temperature Sensor. No cold air. Usually the clutch is the only thing needing to be replaced and not the compressor. I tested this on my grand caravan and I can turn the clutch by hand. Put the clutch onto the compressor shaft by hand as far as it will go. AC compressor is not turning on One of the most obvious signs that the AC relay may have a problem is that the compressor is not coming on at all. a-c compressor clutch not spinning - GMC Jimmy question. There is a pressure switch which detects that there is enough gas and if not the ac clutch won't engage. Once you turn on the AC the center part of the compressor, the AC clutch should engage and start to rotate with the pulley. Hot Air - If you turn on your air conditioner and you only get hot air blowing out of the vents, this is a clear indicator that your AC compressor is failing. A common cause of the ac clutch not turning on is lack of refrigerant gas in the system. Compressor not turning - but can turn by hand. To look at the condition of the compressor, you need an ac manifold gauge set so you can see the refrigerant levels in both sides of the ac system, and how well the compressor is working (if at all). Since my coolant/thermostat has been fixed, my AC has never turned back on and now my Compressor clutch won't engage. php(143) : runtime-created function(1) : eval()'d code(156) : runtime-created. I could have saved a few bucks going with a different brand, but the cheap reman units were still over $200, so I figured I would just spend a lil more for an OEM one. It turns fine by hand and the system worked fine most of today. So, I need to replace the compressor. The shaft does not appear to be bent. I have tested ground for the compressor and it is good, I even ran a new ground temporarily straight from the battery to double check. one way to test is to try turning the compressor clutch while the ENGINE IS OFF, if the clutch is very hard to turn or won't turn at all by hand then the compressor is bad. The clutch on the compressor is what allows the pulley to engage and disengage from engine power, so the compressor is only turning when it needs to. I found the leak was the "o" ring between the low pressure hose and the compressor. Perform shaft turning smoothness test Rough Running Compressor failure - internal Clutch engaged 1. The blower blows warm air/ ambient Now before I have a shop fix it I'd like to know if there is a place to jump the compressor clutch/ engage it by bypassing the pressure switch or applying voltage direct? to see if the compressor works or not. This kit was comprehensive and includes everything you need to replace the AC compressor clutch on FS10 compressors. This part is the heart of your car's air conditioning system. The ac switch was lit up on the climate control, while I was testing. AC stays off. But after looking at the AC compressor. Compressor not turning. Since you have no problems when not using the A/C, it would lead me to believe that the clutch is okay, but if you're going to replace the compressor, I would install a new clutch field, disc and pulley. Typically you can grip the clutch with your hand and turn the compressor, but it is not easy. I found the leak was the "o" ring between the low pressure hose and the compressor. The problem that I am having is the the Compressor clutch will not kick in toturn on the air. on this setting,the compressor would run all the time. This is especially true during the summer when the weather is hot, which can affect quality and performance. I couldn't 'spin' it or anything. If the one gentleman had a compressor that did not require a puller for the clutch, you are fortunate. AC is not working. AC compressor clutch not engaging Diagnose AC compressor clutch not engaging. php(143) : runtime-created function(1) : eval()'d code(156) : runtime-created. After a late night searching archives Im still not clear on how to jump the compressor. It may have too gas, wrong amount of gas, faulty high/ low pressure switch, faulty coolant temp sensor or faulty wiring to the compressor or one of. But after looking at the AC compressor. I currently have the relay out, sitting in my glove box so the AC does not try to come on. com/public/mz47/ecb. If you are handy, yes you can. Again, most common reason for an A/C compressor not engaging is a lack of refrigerant (check that first). Anyway, I jumped the 12V feed and te compressor lines and the compressor clutch worked. All of a sudden I am not getting cold air from either my front AC or rear (even when the rear is on) THe blower works in both but only blows hot Florida breeze. AC Compressor Drive Ring Inside the air conditioner's refrigerant compressor is a drive ring made of a friction material that is mounted to both sides of the "swash" or "wobble" plate. Have an assistant turn on the AC controls to maximum. Start the truck, turn on the A/C to the coolest setting and high blower, recirc. Now I am back to the car putting it into econ mode. The shaft does not appear to be bent. C on, so I know it has pressure and freon. It turns out the compressor is not locked up. Outside temp was 94 degrees running full fan on Max AC. I tried tapping all the lines to see if that would help but no go. Re: A/C compressor clutch swap Post by hogdoctor » Mon Jun 03, 2019 2:50 pm there is a low system pressure cutout switch between the relay and the compressor clutch, so if you're getting power through the relay, but not to the compressor clutch, you could be low on refrigerant. I would imagine the Imperial used the same AC compressor. Belt squealed and I shut it down immediately. The metal shell was soft and simply buckled and seized the ball bearings inside. Test for AC Compressor Clutch Function. Jumped the pressure swith with a piece of wire. (compressor is starting to seize?? ). Off hand it appears over charged. High pressure on the low side 150 lbs. 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. I have a 2005 3. Clutch on compressor is not turning. If it can be turned (mine is an H4, not exactly the same compressor, but the clutch plate can be rotated by hand fairly easily) then it could be a worn clutch, or a bad AC compressor relay. Check to see if you have any powertrain DTC's first. Is it common for a failing clutch to start slipping after working fine for hours?. CALSONIC V5 & V6 CLUTCH COIL R & I NOTE: Calsonic V6 compressor servicing procedure is not available from manufacturer. If you're here, chances are you've tried to recharge your AC system and found a compressor clutch not engaging issue. in this case, not turning it on at all. The noise is the clutch slipping against the pulley because the compressor is very hard to turn. High pressure on the low side 150 lbs. Cracked or splitting belts can cause further damage to your AC compressor. Would really appreciate help on this. Putting on the ac belt was the hardest part. All types of compressor clutch 10P30B, including Belt Groove as follows: A, 2A, B, 2B, double O. With the engine off I can turn the compressor shafts so I don't think it's locked up. Clutch relay is good. Dealer would not even give an estimate for repair. 5 50k the compressor not engaging when i turn on the ac. What Does an AC Compressor Do? An air compressor is a trigger to start the AC system and an overseer to keep the cycle going. usually between 25-40 low side and 180-225 high side [engine running, ac on]. How the Corvette Air Conditioning Clutch works is relatively basic. If the radiator and compressor fan come on with the A/C on but the compressor clutch does not operate, check the compressor clutch relay. Install shaft key and clutch plate. The clutch is not siezed i can spin it with my hand. compressor’s shaft 10-15 times by hand to. Most systems has a high pressure and a low pressure switch that will turn off the compressor. checked the freon and pressures are good checked ac clutch relay fuse the problem is that the relays are not able to be changed which is part of the under hood fuse panel. It does engage if I jump it off a 12V source. High pressure on the low side 150 lbs. Cracked or splitting belts can cause further damage to your AC compressor. The relays are in the box under the hood on the driver's side. The typical complaint for an AC problem is the AC blows warm air. It was not turning when the AC was turned on. The compressor clutch would not engage. I tested the coil, it had continuity and was not shorted to ground, so that was OK. -Turn A/C off and you should now. Another sign of a problematic compressor is the clutch not moving. My AC is blowing only warm air. If the air conditioning system requires substantial repairs, you may not have. Signs of a Bad or Failing AC Compressor Relay. The Nippondenso AC clutch does not fit as tightly as the C171 so there are no threads on the inside surface opening of the clutch plate into which you would screw a removal tool. Do I need a new FCM or to build your. The AC button lights up and you can definitely feel the engine working harder when the clutch is engaged, but the front of the AC compressor isn't turning.