leaks are usually the orings on the compressor. Suspected Clutch Rotor Bearing Noise. Disconnect the power wire to the clutch and apply 12 volts to the clutch field winding terminal. Wait for the AC clutch in front of the compressor body to engage and spin. On my '97 it turns with no resistance at all. 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. 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. how to manually engage ac compressor clutch. On the Santa Fe the clutch will not turn even without power. It is good idea to have some hands on experience with handling your car’s minor faults. replace those if you need to attempt a fix. If an AC compressor could not turn on, this process could not begin. Any help here would be appreciated. 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. Engaging the AC compressor clutch at home is not rocket science. How long it will keep working is hard to say. Refer to the application section looking up application by Make, Year and Model and select the compressor needed. Method 1: Add More Coolant. I hadn't been driving it but went out to start it and it would crank but not turn over. I have some further advise, but am under a time restraint at the moment. When the switch goes bad, it will no longer be able to measure pressure and will leave the clutch engaged the entire time. It would not disengage. What is the most common reason for an air conditioning compressor not to engage? replace the two orings on the hoses that bolt to the compressor. The AC compressor continued to turn even after I pulled the 12-volt supply wire to the unit. Measure with a feeler gauge and adjust as advised by the manufacturer. I'm assuming it'll be nearly empty of refrigerant - you'll usually hear some residual pressure bleed off, but it's minor compared to a full system. The clutch on the compressor is what allows the pulley to … '03H6OBW,'06WRX. Same thought. At this time there was power at the magnetic clutch +ve wire but not now for some reason. 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. The AC compressor clutch has a free-spinning outer pulley. That depends . Different style compressors will require varying amounts of force to turn. Connect your negative, or black battery cable with the grounded contact in the compressor. On a completely empty system, I started by adding about a half can of 134a. I like my fingers too much to stick them that close to belts and pulleys on a running engine! ***There is no need to pull a vacuum. It is screwed into the refrigerant canister and has two wires extending from it toward the wiring harness. 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. Typically you can grip the clutch with your hand and turn the compressor, but it is not easy. 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. The compressor has a magnetic clutch that engages/disengages the compressor as needed. Now, turn on the air conditioning and look again. The low-pressure switch tells the car that the clutch needs to engage and disengage and will shut off the A/C compressor. Didn't seem like it was grinding or anything, just difficult to turn. This is a video that is geared towards people with an AC compressor clutch that doesn't work. The vacuum pump is for systems that are completely empty and air may have gotten in, or the system is opened up. Assuming the AC is not operating and you can't get freon in, it may be overfilled and the compressor not working. 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 … while the system is dead replace the orings where the hoses bolt to the compressor - those are the most common leakage points. 3. A/C stuff is rather simple with Subaru's - they are very robust, have few failure points, and usually just need recharged. Not sure what's going on. Hi, my 97 OB's A/C doesn't work. Even tape is good enough, a there should have been slight residual oil layer on the metal surfaces. Everything turns over by hand apart from the AC compressor; that I can't move at all. The next DIY step up from that I think would involve buying an A/C pressure gauge set from Harbor Freight. How can I force the clutch to engage so I can recharge the circuit? 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. There is a relay that turns on the AC clutch. This will allow the compressor drive and the engine to … The compressor clutch doesn't seem to be engaging. If you do not feel any suction then you have a compressor that is bad. 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. A common cause of the ac clutch not turning on is lack of refrigerant gas in the system. A car AC compressor clutch is used to connect and disconnect drive power to the car’s AC compressor shaft. If you feel a good suction then replace the expansion valve, evacuate, and recharge. Suspected Clutch Rotor Bearing Noise. Option 2  buy same can with the ghetto pressure gauge attached. 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. On the contrary, the AC continued to work properly. Yea the gauge on a cheap hose attaching to a can is not terribly accurate, but it doesn't need to be. The clutch on the compressor is what allows the pulley to … I would put gauges on first. I'm guessing I used 50 to 75% of the contents of the bottle. I … 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). In this article, you will learn what you can do during such a situation. If resistance is not … (or w'ever is recomm. Asked by mello in Fort Lauderdale, FL on . 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. Put a little oil in the intake port and turn until some oil might come out. If it will not move then the compressor clutch has failed and likely the compressor is damaged too. There is a pressure switch which detects that there is enough gas and if not the ac clutch won't engage. 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 van stalled and would not start for about 10 minutes. Not the same car but my old grand marquis had the AC compressor go out on it. patrick mannion of Greg Solow's Engine Room on . The clutch will normally 'engage' with a clicking sound if it working. Is there an easy way to tell whether the A/C clutch failed, or the compressor? If you remove the relay and jump the terminals for the contacts, you should see the clutch engage. This switch is located on the metal canister next to the compressor. This switch is located on the metal canister next to the compressor. then, drive. 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. The compressor started turning after I added some of the refrigerant. When the AC system is turned "off" the power to the AC clutch assembly is 11.5 volts. The good set only cost me about $20 more than the one from Harbor Freight. Here, we have simplified three methods of engaging an AC compressor clutch all by yourself. It may just be internal corrosion if the compressor was not sealed at the ports. I stopped the engine and i was able to turn it by hand, but it was difficult. 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. 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