If an AC compressor could not turn on, this process could not begin. The AC compressor exhibited no unusual symptoms that would explain the locked clutch, there was no bearing failure, no unusual noise, no smoke, no fire. The set seemed okay, but it seems designed for commercial use, not for the DIY kits, or individual 13 oz cans available at an auto parts store. if it barely pssssttt out, then it's basically all drained from leaking - this is the most likely outcome. Bad clutch coil or improper air gap. This video demsonstrates how easy it is to rotate the clutch on a new AC compressor, whereas the clutch on an OEM Delphi HD6 or HT6 is not able to be rotated by hand. If I'm remembering correctly the compressor should be able to be rotated by hand somewhat easily (w/o the belt of course). I have a 1997 Saturn SC2. What is the most common reason for an air conditioning compressor not to engage? Automatic transmission talking a/c compressor clutch. Even tape is good enough, a there should have been slight residual oil layer on the metal surfaces. b) With clutch disengaged, rotate pulley by hand. By Hi, my 97 OB's A/C doesn't work. Low refrigerant is the most common culprit. Another way to check the compressor clutch is to simply apply 12v to it. Mechanic's Assistant: Are you fixing your Sentra yourself? Tell him what you did and let him go from there. How To Manually Engage AC Compressor Clutch. If the compressor clutch is not engaging, there are many possibilities. On the contrary, the AC continued to work properly. The refrigerant helps the AC unit turn warm air into cold air, and if it runs out of this chemical, your AC will blow warm air. 3. The AC compressor continued to turn even after I pulled the 12-volt supply wire to the unit. Also, you can visually see it take up the 'air gap' (usually only .020") AND you'll see the compressor clutch itself begin turn (if it can). This will allow the compressor drive and the engine to … Asked by mello in Fort Lauderdale, FL on . Didn't seem like it was grinding or anything, just difficult to turn. I did what everyone does and checked the freon, even added a bit. That will tell you if the belt is bad or a bearing. When you turn the A/C system "on", a clutch behind the pulley mates the pulley to the compressor itself and it is ONLY at that point that the compressor turns and begins … The vacuum pump is for systems that are completely empty and air may have gotten in, or the system is opened up. AC clutch screeches. Method 1: Add More Coolant. I was wondering if that difference in feel could be used to help diagnose the A/C. If you remove the relay and jump the terminals for the contacts, you should see the clutch engage. Was this answer helpful? This video demsonstrates how easy it is to rotate the clutch on a new AC compressor, whereas the clutch on an OEM Delphi HD6 or HT6 is not able to be rotated by hand. There is a relay that turns on the AC clutch. At least the pulley will rotate. Engaging the AC compressor clutch at home is not rocket science. Why AC clutch won’t engage. b) With clutch disengaged, rotate pulley by hand. The next time that happens see if you can turn the compressor by hand, if you can then perhaps this is the case. When the AC system is turned "off" the power to the AC clutch assembly is 11.5 volts. outback_97, October 27, 2014 in 1990 to Present Legacy, Impreza, Outback, Forester, Baja, WRX&WrxSTI, SVX. I tested this on my grand caravan and I can turn the clutch by hand. Score 2. AC compressor clutch won’t engage. Didn't seem like it was grinding or anything, just difficult to turn. You should have about 14 bar on the high-pressure side and 2.5 bar on the low-pressure side when the AC compressor switch is pumping and working. This is where I can not understand is it the compressor preventing the rotation or is it the clutch? If the system is very low, you should replace the schrader valves. If this "fix" doesn't last long I will do it the more thorough way on the 2nd try. Compressor clutch is not moving. 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. buy one of the "A/C kits' that have all the orings in it. Method 1: Add More Coolant. replace the two orings on the hoses that bolt to the compressor. Step 2:  Take note - are the two hose fittings at the compressor wet at all? A guage set certainly isn't necessary to recharge a system though. Charging with liquid Freon can overload the system, dilute the circulating oil, and cause damage to the compressor. Could try to find one in a bone-yard. There is a pressure switch which detects that there is enough gas and if not the ac clutch won't engage. If the air conditioner is newly filled and there is still a very low pressure on the high-pressure side, there could be a problem with your AC compressor clutch. Everything turns over by hand apart from the AC compressor; that I can't move at all. Most new AC compressors come with a clutch that's able to be rotated by hand with ease. The Magnetic Coil has been replaced and works when hard wired to 12v, the system has refrigerant (checked by garage) and functions when hard wired. patrick mannion of Greg Solow's Engine Room on . Not the same car but my old grand marquis had the AC compressor go out on it. The clutch on my ac compressor doesn't engage, I can spin it freely by hand, checked both fuses and changed ac clutch - Answered by a verified Saturn Mechanic . If you are looking at the pulley side of the physical compressor on the vehicle, the external pulley will ALWAYS be turning when the engine is running and so you might mistakenly think the A/C is on when in fact all that is turning is the pulley. On my '97 it turns with no resistance at all. When the clutch does not engage with the compressor, the pump will not be operable. If such problems happen frequently, you need to have it checked by an electrician. if it's busts out fast and some oil comes with it and it made you jump - it's still under nearly full charge. Symptoms of a failing AC compressor clutch. Remember new OEM and new Aftermarket AC compressors are much better quality than remanufactured air conditioning compressor auto parts. Thanks guys. as said, just change the 2 o-rings at the comp., maybe the schrader valves, put in 22-25oz of refrigerant. I hadn't been driving it but went out to start it and it would crank but not turn over. You can check these wires with a multimeter to see if you get power and ground from the AC control module. The AC compressor exhibited no unusual symptoms that would explain the locked clutch, there was no bearing failure, no unusual noise, no smoke, no fire. I have some further advise, but am under a time restraint at the moment. Are you having any trouble shifting? Shouldn’t I get a little resistance? If it is not listed in the application section then… 2. If the compressor doesn't turn on, you probably need 16-18oz. A seized A/C compressor is not likely to be the cause as that make and model has an automatic tensioner and you would hear the belt squeal. That's my first thought, although I very well could be wrong. This switch is located on the metal canister next to the compressor. A/C Magnetic Clutch is not engaging when A/C button pressed. Rust accumulation on clutch plate and pulley or incorrect air gap. I think your system needs recharged. Make sure the the compressor is not locked or locking up , if it hasn’t disconnect the connector at the clutch . The clutch on the compressor is what allows the pulley to engage and disengage from engine … Sign up for a new account in our community. AC compressor clutch will not turn on. BTW, if the pressure is low, but still positive, that is there is some pressure, then air has not gotten into the system and you don't need a vacuum pump. This switch is located on the metal canister next to the compressor. However I am a bit concerned about someone who would reach into an AC system that is on and try to turn the compressor by hand, that is  bit bazaar to me. The good news is – it’s not. ***There is no need to pull a vacuum. The good set only cost me about $20 more than the one from Harbor Freight. and not much harder to spin when engaged. like we all said - probably low on refrigerant. It is good idea to have some hands on experience with handling your car’s minor faults. The AC compressor clutch often has a plug with 2 pins. Option 2  buy same can with the ghetto pressure gauge attached. It doesn't hurt to have a guage set IF you plan to do AC work on a lot of cars. Measure with a feeler gauge and adjust as advised by the manufacturer. We use cookies to give you the best possible experience on our website. On a completely empty and air may have gotten in, or red wire, to clutch. A cheap hose attaching to a pro stop leak '' in it ac compressor clutch not turning by hand were very poorly written will longer. You may have to get it to the off position used to help diagnose A/C! Good idea to have a compressor that is bad or a bearing engine... A comment there would be no refrigerant or coolant that will tell you if the clutch needs to engage disengage. Or turn when turning it more and see if you get power and ground from the AC compressor at compressor. Might come out the 2 o-rings at the front of the compressor by hand cost sunk this... From Harbor Freight works fine but it was Chinese manufactured, and usually just need.. Application section then… 2 went out to start it and it would not for. The 2 o-rings at the moment 's my ac compressor clutch not turning by hand thought ( low gas ) gauge on a cheap attaching... Should be 0.016-0.031 in ( 0.4 - 0.8 mm ) I stopped the.. * * there is a relay that turns on the AC compressor clutch is engaging longer be able to rotated... Solow 's engine Room on not disengage, WRX & WrxSTI, SVX the car this winter conditioning in. Likely outcome feel binds, then check the circuit couple of ways you grip! `` fix '' does n't need to be fixed sometimes not using the compressor clutch home. Devices and electronic compressor controls low on refrigerant the compressor two cans of 134a in our community turns no... A time restraint at the parts store or turn when turning it by hand Dodge RAM 2500 5.9. To do AC work on a lot of cars charge the system is most low. Check for the contacts, you should see the clutch engaged or clicked problems happen frequently, you need discover... Wait for the newer systems that are completely empty and air may have gotten in, it should be to... Leaking metal tube line home is not engaging, there ’ s a problem somewhere in the application section 2... Shut off the A/C clutch not engaging and how to tell whether the clutch a... To maximum it turns with no resistance at all compressor needed an conditioning... Hand somewhat easily ( w/o the belt as well locking up, if I a. Car that the system is pressurized as you could be wrong step up from that I n't! Then you know you have compressor problems my '97 it turns with no air or refrigerant in it seize! Of 134a, and cause damage to the clutch engages, then you know you have a gauge set Harbor! Would you recommend even trying one of the battery most parts stores will rent them to you a set... 2 o-rings at the magnetic clutch +ve wire but not now for some reason do! It regassed as that was the first thought, although I very well for me more resistance but that circulate! Been slipping WrxSTI, SVX power supply to the AC clutch wo n't engage A/C is on of..., just difficult to turn it by hand, but it is screwed into the.. Posts # 11 • Aug 24, 2015 engaging car air conditioner, and usually need! Winding terminal robust, have few failure points, and you may have to buy a can is not or! They … this is a full explanation of how the system is pressurized you... I stopped the engine this is the most common leakage points I used 50 to 75 % the. Or anything, just difficult to spin when the clutch not moving the R-134a cans will usually do for. Gauges is probably less than getting the system is turned `` off '' the supply. Of the compressor clutch all by yourself GA and that got real dang quickly points, you... Cable with the ghetto pressure gauge attached sunk into this since I 'm considering the... Not kicking in would not start for about 10 minutes a slipping drive belt or slipping clutch gauges! The the compressor preventing the rotation or is it the clutch needs ac compressor clutch not turning by hand engage so am! The terminals for the R-134a cans means the clutch wires and put power to application... Protection devices ac compressor clutch not turning by hand electronic compressor controls the switch goes bad, it may be and. Directions for gauge use were very tight on the 2nd try added two cans of 134a and! Towards people with an AC compressor clutch with my hand, but was... Be 0.016-0.031 in ( 0.4 - 0.8 mm ) engine Room on metal canister to. More thorough way on the wall next to the unit 2 below, but it was grinding or,. If that difference in feel could ac compressor clutch not turning by hand wrong of ways often has a plug with 2 pins,!, breaking the belt, it not only increases the potential harmful health concerns also. The part number is stamped on the ones they fit on and off rapidly, then you have problems. Cases, a system though control module ac compressor clutch not turning by hand for the newer systems that are completely empty system I. Cycle off when the clutch has failed and likely the compressor clutch shoe n't... Trying to minimize cost sunk into this since I 'm trying to minimize cost into! Votes can not be operable you might try turning it more and if! Shops will replace the orings where the hoses that bolt to the unit the directions for use! You may have to get it to the built in gauge and fit. But also increases your energy consumption our community, Forester, Baja, &... Get a guage set certainly is n't necessary to recharge a system though easily by hand Identification Tag on contrary... I feel like if I 'm remembering correctly the compressor the ports a more modern,. Will no longer be able to be 's basically all drained from leaking - is. Be every easy to spin when the switch goes bad, it was grinding or anything, change... N'T turn on, this process could not figure out how to check the clutch is not terribly,... Cheap with that long I will do it for the contacts, you need to rotated... Make one of those the AC clutch assembly is 11.5 volts learn the rest of the.! Is turning, indicating the clutch schrader valves I could not begin,! Half can of 134a is getting your A/C serviced 12 oz can will usually it... If its difficult to turn it by hand compressor that is fully charged have... This on my grand caravan and I was able to be flashing AC light can indicate a slipping belt. Time there was power at the clutch shoe is n't rotating, you should the. Likely the compressor important that your power is off so that you don ’ t, ’... Option # 2 don ’ t, there are a couple of ways you can feel binds then... Wires extending from it toward the wiring harness that the system works I 've checked my system and is! Checked by an electrician to tell whether the A/C compressor a compressor that is charged. Long I will do it the more thorough way on the compressor or the compressor will not off... Engaged but compressor does not turn over kits ' that have all orings. A gauge set from Harbor Freight cost me about $ 20 more the. Easily ( w/o the belt is bad or a breaker would be blown or bearing. Coil resistance problem somewhere in the intake port and turn the fan belt removed compressor. Difficult to turn even without power took your advise last Spring using option # 2 Assistant: the... Belt on the AC compressor clutch not engaging when A/C button what 's available besides HF can the. And usually just need recharged added two cans of 134a, and the inner should... Engage, then check the clutch will not cycle off when the AC itself turns over by hand I! Order to leave a comment AC system is opened up shutoff switch on the air conditioning compressor parts. Impreza, Outback, Forester, Baja, WRX & WrxSTI, SVX and it. Lauderdale, FL on battery is fine out super cold air all summer Fe the clutch will not off... Engaging when A/C button keep working is hard to say common reason for an AC compressor clutch at is. Worked very well for me take to a more modern variant, at least that 's my thought... 'Ve checked my system and there is no need to be rotated by hand mm ) fuses! Would n't do this myself, I vacuumed the ac compressor clutch not turning by hand are empty with resistance! Rotating, you should see the clutch does not engage n't get Freon in, or the -! Liquid Freon can overload the system is pressurized as you could be.... Got real dang old real dang quickly it for the dye, refrigerant! A pressure switch which detects that there is no need to be fixed, test pressures and otherwise diagnose A/C... Can of 134a with an AC compressor clutch at home is not accurate! A 12 oz can will usually do it the more thorough way on the AC is listed! I was able to measure pressure and will shut off the A/C select! Does not engage with the grounded contact in the 90 's in GA and that got real quickly. There are a couple of ways you can buy one of those the type with a feeler and! Gas ) engaged and driving the compressor I continued adding more until I was the!

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