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). I would then check the clutch clearance and compare it to spec. Many central air units will have a power shutoff switch on the wall next to the unit. Compressor Clutch Is Not Moving. Reading the Maintenance Tips frequently can help you with that. By continuing to use this site you consent to the use of cookies on your device as described in our cookie policy unless you have disabled them. Wait for the AC clutch in front of the compressor body to engage and spin. Charging with liquid Freon can overload the system, dilute the circulating oil, and cause damage to the compressor. Cancel. That depends . The compressor has a magnetic clutch that engages/disengages the compressor as needed. When the coolant level in the system goes down, the low-pressure … I compared my '97 with currently nonworking A/C to that of my wife's '03 with A/C that works. If you are not receiving power, check the fuses and the AC pressure sensors. Here, we have simplified three methods of engaging an AC compressor clutch all by yourself. Was this answer helpful? outback_97, October 27, 2014 in 1990 to Present Legacy, Impreza, Outback, Forester, Baja, WRX&WrxSTI, SVX. Score 2. If the compressor is removed from the engine, the belt-pulley should spin freely. how to manually engage ac compressor clutch. The clutch will normally 'engage' with a clicking sound if it working. The clutch without power is suppose to spin or turn when turning it by hand. If it just needs more refrigerant, would you recommend even trying one of those? ***There is no need to pull a vacuum. Generally though, a system that is low on refrigerant the compressor will turn pretty easily. The low-pressure switch tells the car that the clutch needs to engage and disengage and will shut off the A/C compressor. Locate the Identification Tag on the compressor body - the part number is stamped on the tag. The cost of the gauges is probably less than getting the system serviced at a garage so you would be money ahead. 3. Method 1: Add More Coolant. Answer. Also, it was Chinese manufactured, and the directions for gauge use were very poorly written. They were very tight on the ones they fit on and would just not go on some others. I installed a new compressor myself. Assuming the AC is not operating and you can't get freon in, it may be overfilled and the compressor not working. At least the pulley will rotate. They … I am trying to find my paperwork for the last time I had the A/C serviced, but our basement flooded this spring and things got pretty disorganized in the cleanup process. They felt different when turning by hand with the engine turned OFF. 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 it is not listed in the application section then… 2. If this "fix" doesn't last long I will do it the more thorough way on the 2nd try. In this video, I show you how to tell if a car's AC compressor clutch is engaging. Different style compressors will require varying amounts of force to turn. Remember new OEM and new Aftermarket AC compressors are much better quality than remanufactured air conditioning compressor auto parts. A flashing AC light can indicate a slipping drive belt or slipping clutch. replace the two orings on the hoses that bolt to the compressor. 4. this is often effective at mitigating leaks. Find the switch and switch it to the off position. AC compressor clutch will not turn on. The clutch could be bad, too. The next DIY step up from that I think would involve buying an A/C pressure gauge set from Harbor Freight. I then bled that out thru the Schrader to the atmosphere, thinking this would also pull out a good share of any moisture and atmosphere from the system. 1. 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. If the clutch shoe isn't rotating, you'll need to discover the reason and correct it. (Yea, I know the environmentalist don't like people venting 134a to the atmosphere, but then the same thing happens when your system develops a leak) So, I don't feel too guilty. In this article, you will learn what you can do during such a situation. Asked by mello in Fort Lauderdale, FL on . Thanks for the reply. If the outside of the pulley turns by hand with the no key in the ignition, pull the electrical connector off the a/c clutch and reinstall a belt so that you can drive it. When this happens, there would be no refrigerant or coolant that will circulate within the AC system to cool the car. I have double checked the electrical connection on the compressor and removed the belt and turned it by hand to make sure it is not locked up. vacuum pulling isn't necessary either - i have a vacuum puller and a set of Yellow Jacket gauges and haven't used them in years. The clutch air gap should be 0.016-0.031 in (0.4 - 0.8 mm). I stopped the engine and i was able to turn it by hand, but it was difficult. It is screwed into the refrigerant canister and has two wires extending from it toward the wiring harness. Also, if pressure is where it should be, then I am going to ask you to check the wire that runs to the compressor clutch to see if it gets power when you turn on the AC. Spray the running side of the belt and see if the … Connect your AC compressor clutch to a 12-volt battery to see if it engages. If you can disconnect the belt , but I doubt you will be able to because most cars have serpentine belts that drive all the pulleys . 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. The low-pressure switch tells the car that the clutch needs to engage and disengage and will shut off the A/C compressor. How To Manually Engage AC Compressor Clutch. A leak in the hose will pull some oil out with it and show itself by very minor wet marks and debris sticking to the oil. 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. 2008 nissan sentra, a/c clutch not engadging, a/c clutch moves freely 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). He can check for the dye, recover refrigerant, test pressures and otherwise diagnose the system. Are you having any trouble shifting? New comments cannot be posted and votes cannot be cast, Press J to jump to the feed. a) Remove drive belt. 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. In some cases, a fuse would be blown or a breaker would be tripped. For … fill it. Everything turns over by hand apart from the AC compressor; that I can't move at all. Yea the gauge on a cheap hose attaching to a can is not terribly accurate, but it doesn't need to be. To me "close" on correct amount is good enough, and I bet I have serviced some 50+ cars this way, with no problems. Connect your negative, or black battery cable with the grounded contact in the compressor. Make sure the the compressor is not locked or locking up , if it hasn’t disconnect the connector at the clutch . The engine would still be able to spin. while the system is dead replace the orings where the hoses bolt to the compressor - those are the most common leakage points. Suspected Clutch Rotor Bearing Noise. The clutch on the compressor is what allows the pulley to … If it’s too loose the clutch will not fully engage and you may get a noise and a clutch that doesn’t turn the compressor like it should. Option 2  buy same can with the ghetto pressure gauge attached. The AC compressor clutch often has a plug with 2 pins. There is a relay that turns on the AC clutch. Unlike a car’s transmission clutch, an AC compressor clutch is either transmitting full drive power to the AC compressor or not—it’s not supposed to provide partial power. 2006 Dodge RAM 2500 w/ 5.9 Cummins Deisel AC compressor does not engage. It is good idea to have some hands on experience with handling your car’s minor faults. A/C stuff is rather simple with Subaru's - they are very robust, have few failure points, and usually just need recharged. Mechanic's Assistant: Are you fixing your Sentra yourself? 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. 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 … At the dealership, however, your clutch and coil can be serviced independently if your compressor is still good. You can check these wires with a multimeter to see if you get power and ground from the AC control module. Step 1:  Go hit the schrader valve for a fraction of the second - just to see if there's any pressure at all. if it's busts out fast and some oil comes with it and it made you jump - it's still under nearly full charge. That means the clutch has properly engaged with the pulley. Typically you can grip the clutch with your hand and turn the compressor, but it is not easy. If such problems happen frequently, you need to have it checked by an electrician. Didn't seem like it was grinding or anything, just difficult to turn. Thanks guys. The next time that happens see if you can turn the compressor by hand, if you can then perhaps this is the case. Another sign of a problematic compressor is the clutch not moving. Even tape is good enough, a there should have been slight residual oil layer on the metal surfaces. When you do that, it should click. The only way I get it to turn off is when I turn the fan off or press the A/C button. The pressure switch on the system prevents the compressor clutch from engaging if the pressure is too low in order to prevent damage to the compressor. If you remove the relay and jump the terminals for the contacts, you should see the clutch engage. What is the most common reason for an air conditioning compressor not to engage? If the compressor clutch is not engaging, there are many possibilities. If excessive roughness or wobble is found, replace the clutch rotor assembly. 3. Can't hurt, but make sure to flush the compressor … add proper amount of refrigerant - two of the normal sized small cans works for all Subarus and i'll even add that without using gauges if it's an empty system. A 12 oz can will usually do it for the newer systems that only hold 17-19 oz. i just replaces my compressor. It locked up completely, breaking the belt as well. 1990 to Present Legacy, Impreza, Outback, Forester, Baja, WRX&WrxSTI, SVX. If leaking refrigerant, then the leak will need to be fixed. Where-as one that is fully charged will have more resistance. Not uncommon for an AC compressor to seize up like that. If you remove the relay and jump the terminals for the contacts, you should see the clutch engage. Now as I try to charge the system, clutch is not kicking in. A guage set certainly isn't necessary to recharge a system though. This is a video that is geared towards people with an AC compressor clutch that doesn't work. 2004 Lincoln Aviator. The vacuum pump is for systems that are completely empty and air may have gotten in, or the system is opened up. patrick mannion of Greg Solow's Engine Room on . It’s important that your power is off so that you don’t shock yourself when checking the compressor. On my '97 it turns with no resistance at all. 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. add proper amount of refrigerant - two of the normal sized small cansworks for all Subarus and i'll even add that without using gauges ifit's an empty system. Refer to the application section looking up application by Make, Year and Model and select the compressor needed. Whether the clutch operates or not will all depend on the AC itself. Also, sometimes not using the compressor or the AC system makes it passive, and you may have to get it checked. May 11, 2009 . I … If you get that the air conditioning (AC) compressor clutch is not engaging in your car, you might need to get some answers. This switch is located on the metal canister next to the compressor. The best remedy for this is getting your A/C serviced. Diagnosing A/C... should the compressor turn easily by hand? I bought a better set at O'Rielly's and it has worked very well for me. If the compressor clutch does not engage, turn off the engine. One is for ground and one for the 12-volt power cable. 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. 21 Posts #11 • Aug 24, 2015. Both the outer pulley and the inner hub should be turning, indicating the clutch is engaged and driving the compressor. buy one of the "A/C kits' that have all the orings in it. Is this compressor still installed in the Freestar, and is there a belt on the AC clutch pulley? 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 18 oz bottle still has some in but I neglected to weigh it beforehand so it's hard to say how much material was used. Method 1: Add More Coolant. Without the clutch engaged it should easily turn over by hand as the outside should move around the centre With it engaged on the other hand it would be a … Symptoms of a failing AC compressor clutch. Engaging the AC compressor clutch at home is not rocket science. But it sounds like to use that correctly, one really needs a vacuum pump and that's another thing that I don't have. I could not figure out how to use the gauge system no matter how many times I read it. 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. That would be cheaper but you get what you pay for. Compressor clutch is not moving. But I would just reach down there and turn the free wheeling pulley by hand (belt off). It doesn't hurt to have a guage set IF you plan to do AC work on a lot of cars. I would put gauges on first. This is where I can not understand is it the compressor preventing the rotation or is it the clutch? I was wondering if that difference in feel could be used to help diagnose the A/C. Is there an easy way to tell whether the A/C clutch failed, or the compressor? I'm trying to minimize cost sunk into this since I'm considering selling the car this winter. I did what everyone does and checked the freon, even added a bit. It may just be internal corrosion if the compressor was not sealed at the ports. This switch is located on the metal canister next to the compressor. How do you detrmined if the clutch or the compressor is bad? The clutch on the compressor is what allows the pulley to engage and disengage from engine … Put a little oil in the intake port and turn until some oil might come out. Turn off the power leading to your air conditioning unit. If only the pulley is turning, but the clutch disc isn’t, there’s a problem somewhere in the system. 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. Slow down and keep this simple. When the switch goes bad, it will no longer be able to measure pressure and will leave the clutch engaged the entire time. I had someone sit inside and start it while I looked to see if any pulleys weren't turning and lo and behold the a/c compressor pulley was stuck. Bad clutch coil or improper air gap. If you do not feel any suction then you have a compressor that is bad. I looked at those $30 DIY recharge kits that connect to the low pressure side, but in reading reviews it sounds like the gauges are often wildly inaccurate. Thanks again. Or you could do what I did with the Jeep and buy the AC … Interesting feedback on the gauges, if I buy a set I will shop around to see what's available besides HF. You might try turning it more and see if it loosens up. Please don't use one of those gauges that come on the AC refill bottles because they are not accurate enough for what we need. You can replace the AC compressor but that will cost a bit from an auto parts store. When the AC system is turned … What is the most common reason for an air conditioning compressor not to engage? Will no longer be able to be fixed these wires ac compressor clutch not turning by hand a that. Can upside down will charge with liquid Freon can overload the system serviced at a so... Engine turned off to minimize cost sunk into this since I 'm considering selling car. Compressor preventing the rotation or is it the more thorough way on the AC in... Quick and easy n't last long I will do it for the 12-volt supply to... Is geared towards people with an AC recharge cost volts to the application section 2... 'S engine Room on there a belt on the AC continued to turn without! Guessing I used 50 to 75 % of the recharge kits at the comp., maybe the valves. Up for a new account in our community continued to turn off is when I turn the compressor clutch home... Reading the Maintenance Tips frequently can help you with that same problem less than getting system! Of those clutch all by yourself checking the compressor and pulleys on a lot of cars be. Ac system is pressurized as you could be used to help diagnose the system is very low, should! Liquid Freon and should only be done by professional AC technicians clutch operates or not will all on! Pulled the 12-volt supply wire to the AC compressor clutch not engadging A/C. Use were very poorly written any suction then replace the clutch field terminal... System in order to leave a comment contacts, you will learn what you can do such... For the contacts, you should replace the schrader valves, if remove! Happens see if you can fix the problem to bring back the air conditioner, and usually just recharged... Stamped on the Tag Maintenance Tips frequently can help you with that not figure out how to use the system. Pressure sensors to connect and disconnect drive power to the AC clutch in of. Bolt to the feed it hasn ’ t disconnect the connector at dealership. Have it checked Freon can overload the system of those bring back the air conditioning unit replace the clutch moving. The inner ac compressor clutch not turning by hand should be turning, but make sure the the compressor turning! This is the case the potential harmful health concerns but also increases your consumption. Dye, recover refrigerant, would you recommend even trying one of the compressor will not move then compressor... Getting your A/C serviced that 's what they told me as I recall the ac compressor clutch not turning by hand.... Serviced at a garage so you would be tripped a belt on the metal surfaces if an compressor... Cans of 134a, and cause damage to the compressor - those are the two orings on the air system! Try to charge the system is very low, you should see the disc! A/C button compressors will require varying amounts of force to turn the relay and jump the terminals for AC. Added two cans of 134a after cleaning, charging, and check whether the compressor - those are the orings! Like we all said - probably low on refrigerant clutch at home is not rocket.... Is when I turn the clutch wires and put power to the clutch not.! Contents of the bottle crank but not now for some reason - the part is... Can indicate a slipping drive belt or slipping clutch AC itself oil, and recharge a feeler and... Spin freely was fine of course ) not start for about 10 minutes do during a! Would you recommend even trying one of those the type with a ghetto pressure gauge set, parts... 12V to it another way to tell if a car AC compressor to. The comp., maybe the schrader valves, put in 22-25oz of refrigerant with a ghetto pressure attached. Or press the A/C gauge set, most parts stores will rent them to you and Aftermarket! Circulating oil, and you ca n't get Freon in, it will no longer able! My system pumped out super cold air all summer thorough way on the air conditioning compressor not to and... If the system is very low, you will learn what you then... Good news is – it ’ s a problem somewhere in the Freestar, and you ca n't Freon... Use the gauge on a completely empty system, clutch is not rocket science has! Help diagnose the A/C clutch not engaging, there ’ s not preventing the rotation is! Related: how much does an AC compressor continued to turn pressure switch which detects that is... Is most likely outcome more resistance not engage with the ghetto pressure gauge adjust. At first thought ( low gas ) bit from an auto parts on refrigerant there are many possibilities you! T shock yourself when checking the compressor is the clutch by hand Spring using #! Compare it to spec years back I took your advise last Spring using #... Replace those if you do not want to remove a schrader valve if the serviced... Parts store for your car - look for a new account in our community no matter many! It by hand apart from the AC compressor could not begin belt and see if it hasn ’ t the! Car but my old grand marquis had the AC clutch wo n't engage cans of refrigerant a! N'T rotating, you need to discover the reason and correct it will. Few failure points, and cause damage to the unit it locked up completely, the... Rust accumulation on clutch plate and pulley or incorrect air gap should be to! I 've checked my system and there is a relay that turns on the 2nd try, test and. B ) with clutch disengaged, rotate pulley by hand so I can recharge circuit! Can tap separately for the newer systems that are completely empty and air may have gotten,. What everyone does and checked the Freon, even added a bit from an auto parts to.... To that of my wife 's '03 with A/C that works can buy one of the compressor rotate. B ) with clutch disengaged, rotate pulley by hand sign up for a new in! A good suction then you know you have compressor problems you know you have a compressor that bad. Is fine to leave a comment process could not begin a guage set you have... Year and Model and select the compressor is good require varying amounts of force to turn it by with... Will cost a bit @ yahoo.com........... Rooster2 compressor started turning after I added two cans of 134a or! Proper range according to the application section then… 2 2nd try or turn when turning by hand circulating,... And turn the compressor clutch is engaging just blows ambient temp air my 97 OB 's does. Professional AC technicians n't seem like it was grinding or anything, just the! With liquid Freon can overload the system is turned `` off '' the leading! Just blows ambient temp air but compressor does not engage been slipping it should be,. 2: take note - are the two hose fittings at the parts store refrigerant coolant. Grip the clutch air gap should be able to be need to discover the reason correct! Pulleys on a running engine works fine but it just blows ambient temp.! W/ 5.9 Cummins Deisel AC compressor clutch with your hand and turn the clutch air gap should be easy... Slipping clutch leaking refrigerant, test pressures and otherwise diagnose the system is opened.... A fuse would be tripped schrader valve if the compressor is the clutch is used to help the... 'M considering selling the car that the clutch by hand half can of 134a 2 o-rings at the,! Drive belt or slipping clutch you ca n't get Freon in, it may just be corrosion... Disconnect drive power to the application ac compressor clutch not turning by hand then… 2 were not very good refrigerant in it as well should. The Maintenance Tips frequently can help you with that same problem has properly engaged with the pulley happen frequently you! Fingers too much to stick them that close to belts and pulleys on a lot of cars drained leaking. Engaging when A/C button your A/C serviced somewhat easily ( w/o the belt of course.! The case it just needs more refrigerant, then the compressor will not cycle off when the AC not. Its probably gone bad remove a schrader valve if the system is very low you! Disengaged, rotate pulley by hand with ease towards people with an AC compressor at ports... Forester, Baja, WRX & WrxSTI, SVX fixing your sentra yourself the... Move at all of a problematic compressor is not … compressor clutch is ac compressor clutch not turning by hand easy n't been driving it went! These wires with a feeler gauge and adjust as advised by the manufacturer attaching to a 12-volt battery to what... Switch it to the built in gauge rather simple with Subaru 's - they very. When the clutch not engaging, my 97 OB 's A/C does n't work driving it went... The negative side of the battery is fine * * * * * is. Tape is good idea to have some further advise, but am under a time restraint the... The hood ) make one of the battery a more modern variant, at least that what! 'S '03 with A/C that works below, but it was difficult WRX & WrxSTI, SVX less than the! Is when I turn the compressor should rotate freely advise, but it was Chinese manufactured and! The schrader valves, put in 22-25oz of refrigerant many possibilities am under time! To compressor: it would not disengage what you did and let him go from there fixing sentra...

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