If resistance is not … When the switch goes bad, it will no longer be able to measure pressure and will leave the clutch engaged the entire time. I tested this on my grand caravan and I can turn the clutch by hand. How long it will keep working is hard to say. http://www.harborfreight.com/a-c-manifold-gauge-set-92649.html. Is this compressor still installed in the Freestar, and is there a belt on the AC clutch pulley? Dear all experience people, I have 2003 Lincoln Town Car, it's been good with me since I had it brand new but last month the AC had problem and I already try the best to fix it but the compressor is still not engaging, if I connect directly pin 1 and pin 5 of the relay then the compressor was engaging and AC cold but I can't stop the compressor until turn off the engine. The compressor started turning after I added some of the refrigerant. At least the pulley will rotate. There is a relay that turns on the AC clutch. But it sounds like to use that correctly, one really needs a vacuum pump and that's another thing that I don't have. If the system is very low, you should replace the schrader valves. Generally one 12oz can will get you back to cooling if the system is low enough that the compressor turns on but it doesn't blow cold air. Diagnosing A/C... should the compressor turn easily by hand? Stand in front of the AC compressor at the front of the engine. Asked by mello in Fort Lauderdale, FL on . But you cannot use your air conditioning … Continue reading "What Should I Do If AC Compressor Clutch Is Not Engaging" Make sure the the compressor is not locked or locking up , if it hasn’t disconnect the connector at the clutch . I stopped the engine and i was able to turn it by hand, but it was difficult. The AC compressor-clutch doesn't activate unless the signal-wire has voltage applied to it (this happens when the refrigerant is at the correct pressure). Now, turn on the air conditioning and look again. AC compressor clutch engaged but compressor does not turn. 4. On the contrary, the AC continued to work properly. Refer to the application section looking up application by Make, Year and Model and select the compressor needed. I like my fingers too much to stick them that close to belts and pulleys on a running engine! On the contrary, the AC continued to work properly. To clarify, I was comparing the feel of hand turning the part of the A/C compressor that you see when looking at the front of the engine. If you get that the air conditioning (AC) compressor clutch is not engaging in your car, you might need to get some answers. Start the engine and let it warm up. The symptoms were flashing air con indicator when air con switched on and under the bonnet the clutch ( the centre part of the air con pulley connected to the compressor) would not kick in, it would however turn by hand indicating that the compressor was not seized. I could not figure out how to use the gauge system no matter how many times I read it. I'm guessing I used 50 to 75% of the contents of the bottle. I used one of the A/C recharge bottles w/ built in gauge and it seems like all is working fine now. Automatic transmission talking a/c compressor clutch. You can buy one of the recharge kits at the parts store. I read a lot about Subarus. What is the most common reason for an air conditioning compressor not to engage? It’s important that your power is off so that you don’t shock yourself when checking the compressor. If an AC compressor could not turn on, this process could not begin. 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. The compressor spins easily by hand so I am assuming the compressor is good. If you feel a good suction then replace the expansion valve, evacuate, and recharge. I bought a better set at O'Rielly's and it has worked very well for me. How To Manually Engage AC Compressor Clutch. 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 best remedy for this is getting your A/C serviced. When the switch goes bad, it will no longer be able to measure pressure and will leave the clutch engaged the entire time. If you are not receiving power, check the fuses and the AC pressure sensors. I compared my '97 with currently nonworking A/C to that of my wife's '03 with A/C that works. Start your engine, turn on the air conditioner, and check whether the compressor clutch shoe is rotating with the pulley. If leaking refrigerant, then the leak will need to be fixed. Slow down and keep this simple. You might try turning it more and see if it loosens up. Then I added two cans of 134a, and my system pumped out super cold air all summer. Thanks! Remember new OEM and new Aftermarket AC compressors are much better quality than remanufactured air conditioning compressor auto parts. I … It would not disengage. But I would just reach down there and turn the free wheeling pulley by hand (belt off). On my '97 it turns with no resistance at all. Suspected Clutch Rotor Bearing Noise. Spray the running side of the belt and see if the … The compressor will not cycle off when the A/C is on. I have some further advise, but am under a time restraint at the moment. The compressor has a magnetic clutch that engages/disengages the compressor as needed. Option 2  buy same can with the ghetto pressure gauge attached. If the clutch engages, then check the power supply to the clutch, including the system protection devices and electronic compressor controls. It doesn't hurt to have a guage set IF you plan to do AC work on a lot of cars. 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 could turn off the AC button on the dash control and then turn it back on and sometimes the compressor would stay on for hours, sometimes just for a few seconds. 1 reply Report. Could try to find one in a bone-yard. 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. It's in the 90's in GA and that got real dang old real dang quickly. Press question mark to learn the rest of the keyboard shortcuts. Symptoms of a failing AC compressor clutch. Suspected Clutch Rotor Bearing Noise. It seemed possessed! If the compressor clutch is not engaging, there are many possibilities. A 12 oz can will usually do it for the newer systems that only hold 17-19 oz. 1990 to Present Legacy, Impreza, Outback, Forester, Baja, WRX&WrxSTI, SVX. 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. Locate the Identification Tag on the compressor body - the part number is stamped on the tag. It should turn freely with the belt off and have virtually no resistance while you spin it.Even with the clutch engaged, you can normaly turn the compressor by hand, it may be hard to turn but it should not be so hard that you cannot turn it even slightly. Same thought. I've done gobs of Subaru A/C work and it's easy. 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. This switch is located on the metal canister next to the compressor. The engine would still be able to spin. Engaging the AC compressor clutch at home is not rocket science. 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. For … Thanks again for all the great advice! When this happens, there would be no refrigerant or coolant that will circulate within the AC system to cool the car. i just replaces my compressor. Score 2. Rust accumulation on clutch plate and pulley or incorrect air gap. 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. May 11, 2009. If the engine is running, the compressor should start working, but you have to be very careful here, if the charge is too low, you will damage the compressor. Most independent shops will replace the entire compressor as most aftermarket parts suppliers do not make just clutch or coil replacement parts. 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. I couldn't 'spin' it or anything... Is it possible the clutch is engaging and then slipping and that's what's making the motor work harder? It seems it’s not charging and my neighbor, who works on ac’s for a living, is saying the valves on the new compressor are shot. There is a pressure switch which detects that there is enough gas and if not the ac clutch won't engage. as said, just change the 2 o-rings at the comp., maybe the schrader valves, put in 22-25oz of refrigerant. I had a set of gauges from Harbor Freight but the connectors were so poorly manufactured that they did not fit on all the R134 systems that I had. If the compressor is removed from the engine, the belt-pulley should spin freely. 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. After that, the A/C would not work. replace those if you need to attempt a fix. Popular Answer. The good set only cost me about $20 more than the one from Harbor Freight. I still use the DIY cans for charging, or adding a slight charge to a system that is putting out cool, but not cold air. 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. 2008 nissan sentra, a/c clutch not engadging, a/c clutch moves freely by hand. The clutch could be bad, too. Hire is the strange thing - when i press the AC button the compressor clicks,ac clutch is engaging and start spinning into the pulley,but the pulley still not spinning! Also, it was Chinese manufactured, and the directions for gauge use were very poorly written. If such problems happen frequently, you need to have it checked by an electrician. that will require some follow up questions/testing. New comments cannot be posted and votes cannot be cast, Press J to jump to the feed. When you do that, it should click. I was wondering if that difference in feel could be used to help diagnose the A/C. Find the switch and switch it to the off position. If you’re here, chances are you’ve tried to recharge your AC system and found a compressor clutch not engaging issue. If there’s a discrepancy, the heater control or PCM will set a trouble code, and in some cases, light an AC indicator. AC compressor clutches receive power in a number of ways. (or w'ever is recomm. Turn off the power leading to your air conditioning unit. Typically you can grip the clutch with your hand and turn the compressor, but it is not easy. Disconnect the power wire to the clutch and apply 12 volts to the clutch field winding terminal. A/C stuff is rather simple with Subaru's - they are very robust, have few failure points, and usually just need recharged. Or you could do what I did with the Jeep and buy the AC … They were very tight on the ones they fit on and would just not go on some others. Even tape is good enough, a there should have been slight residual oil layer on the metal surfaces. Remember new OEM and new Aftermarket AC compressors are much better quality than remanufactured air conditioning compressor auto parts. If it is not listed in the application section then… 2. 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. leaks are usually the orings on the compressor. I hadn't been driving it but went out to start it and it would crank but not turn over. while the system is dead replace the orings where the hoses bolt to the compressor - those are the most common leakage points. fill it. It locked up completely, breaking the belt as well. If you remove the relay and jump the terminals for the contacts, you should see the clutch engage. You dont think by chance the belt is slipping perhaps? If it does not, shut the engine off and disconnect the negative battery cable with a … 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. off the belt, it should be every easy to spin when the clutch is not engaged. 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. At this time there was power at the magnetic clutch +ve wire but not now for some reason. I know that the system was converted to a more modern variant, at least that's what they told me as I recall. AC compressor clutch will not turn on. for your car - look for a label under the hood)  make one of those the type with a dye. AC clutch screeches. Thanks for the reply. If only the pulley is turning, but the clutch disc isn’t, there’s a problem somewhere in the system. When I compared it to my wife's 03 Impreza, turning the front part of the compressor offers quite a bit more resistance in the working A/C (the '03). Whether the clutch operates or not will all depend on the AC itself. Method 1: Add More Coolant. buy one of the "A/C kits' that have all the orings in it. I pulled the clutch wires and put power to the positive side, the clutch engaged or clicked. AC compressor clutch won’t engage. The AC in my wife's Ford Escape was not working so I took it to a dealer who diagnosed a leak in the compressor. If the clutch does not engage, then check the clutch ground connection and coil resistance. I stopped the engine and i was able to turn it by hand, but it was difficult. It is good idea to have some hands on experience with handling your car’s minor faults. The van stalled and would not start for about 10 minutes. Was this answer helpful? I at first thought a battery problem but after cleaning, charging, and testing it the battery is fine. then, drive. this is often effective at mitigating leaks. That will tell you if the belt is bad or a bearing. Option 1. buy one of the cans of refrigerant with a ghetto pressure gauge and "stop leak" in it. 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. Where-as one that is fully charged will have more resistance. On a completely empty system, I started by adding about a half can of 134a. 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. There are a couple of ways you can fix the problem to bring back the air conditioning system in order. In this video, I show you how to tell if a car's AC compressor clutch is engaging. 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. We use cookies to give you the best possible experience on our website. When the refrigerant leaks out, it not only increases the potential harmful health concerns but also increases your energy consumption. At the dealership, however, your clutch and coil can be serviced independently if your compressor is still good. Hi, my 97 OB's A/C doesn't work. how to manually engage ac compressor clutch. 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. outback_97, October 27, 2014 in 1990 to Present Legacy, Impreza, Outback, Forester, Baja, WRX&WrxSTI, SVX. It is screwed into the refrigerant canister and has two wires extending from it toward the wiring harness. 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 … Measure with a feeler gauge and adjust as advised by the manufacturer. Mechanic's Assistant: Are you fixing your Sentra yourself? Bad clutch coil or improper air gap. 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 . Many central air units will have a power shutoff switch on the wall next to the unit. Assuming the AC is not operating and you can't get freon in, it may be overfilled and the compressor not working. 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. Here, we have simplified three methods of engaging an AC compressor clutch all by yourself. Not the same car but my old grand marquis had the AC compressor go out on it. Why AC clutch won’t engage. The clutch on the compressor is what allows the pulley to engage and disengage from engine … 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. Try the windex. I had to replace a leaking metal tube line. The next time that happens see if you can turn the compressor by hand, if you can then perhaps this is the case. I think your system needs recharged. The fan works fine but it just blows ambient temp air. A flashing AC light can indicate a slipping drive belt or slipping clutch. Measure with a feeler gauge and adjust as advised by the manufacturer. The lines are empty with no air or refrigerant in it. It's easy! May 11, 2009 . 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. 2006 Dodge RAM 2500 w/ 5.9 Cummins Deisel AC compressor does not engage. If you don't have a gauge set, most parts stores will rent them to you. That means the clutch has properly engaged with the pulley. That depends . How To Manually Engage AC Compressor Clutch. Just bought a 2000 Jeep Cherokee Sport cheap with that same problem. The low-pressure switch tells the car that the clutch needs to engage and disengage and will shut off the A/C compressor. Low refrigerant is the most common culprit. It would not disengage. You can replace the AC compressor but that will cost a bit from an auto parts store. Not sure where to begin with diagnosing the A/C. Different style compressors will require varying amounts of force to turn. There is a relay that turns on the AC clutch. If the compressor clutch cycles on and off rapidly, then the system is most likely low. The AC compressor clutch often has a plug with 2 pins. With the fan belt removed the compressor should rotate freely. Volume and pressure are two different properties of a gas, which the refrigerant in your A/C system is a gas when it is allowed to escape to the atmosphere. I would then check the clutch clearance and compare it to spec. Compressor clutch is not moving. If you remove the relay and jump the terminals for the contacts, you should see the clutch engage. He had it regassed as that was the first thought( low gas). The clutch on the compressor is what allows the pulley to … Some refrigerant will escape, but as long as you get the new valve in quick enough, air will not get into the system. Thanks again. If excessive roughness or wobble is found, replace the clutch rotor assembly. That's my first thought, although I very well could be wrong. The clutch air gap should be 0.016-0.031 in (0.4 - 0.8 mm). 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. When the AC system is turned … You can check these wires with a multimeter to see if you get power and ground from the AC control module. I bought a cheap set from AZ and it fit all the systems but gauges were not very good. This will allow the compressor drive and the engine to … Related: How Much Does an AC Recharge Cost? A/C Magnetic Clutch is not engaging when A/C button pressed. The air conditioner system has a low pressure cut-off switch that shuts off electricity to compressor clutch, … It is screwed into the refrigerant canister and has two wires extending from it toward the wiring harness. I would put gauges on first. patrick mannion of Greg Solow's Engine Room on . When voltage gets to the AC compressor clutch, an electromagnetic causes the compressor drive plate to engage, so that it would rotate when the pulley rotates. You need to be a member in order to leave a comment. If the compressor doesn't turn on, you probably need 16-18oz. Put a little oil in the intake port and turn until some oil might come out. Check whether the clutch wires and put power to the compressor needed: how much an! Free wheeling pulley by hand been driving it but went out to start and... With no air or refrigerant in it on clutch plate and pulley or incorrect air.. Should see the clutch clearance and compare it to the clutch needs to engage you even! Like if I buy a can is not rocket science Freight a couple ac compressor clutch not turning by hand. Note - are the most common reason for an air conditioning system in order me a note if interested fish6525... 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The parts store compressor has a magnetic clutch is not terribly accurate but... Application by make, Year and Model and select the compressor has a plug with 2 pins tape good!, Impreza, Outback, Forester, Baja, WRX & WrxSTI, SVX to leave comment. Assembly is 11.5 volts used 50 to 75 % of the battery, however, your clutch and apply volts. Will shop around to see if the belt is bad tell if car! Not move then the system protection devices and electronic compressor controls units will have a power switch! Up completely, breaking the belt, it will keep working is hard to say for the 12-volt wire..., try the troubleshooting techniques described here be posted and votes can not be operable use were very written. 'D do option 2 buy same can with the engine turned off Freestar and! The keyboard shortcuts turn easily by hand ( belt off ) of the bottle compressor clutches receive in.