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Wiring for AC volvo940 1991

No power to compressor for AC

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1999 GMC air cond. AC clutch wont engage. system is charged. relay, fuze,and low pressure switch are replaced.


ac compressor clutch coil open or short. wire cut or open to ac clutch.2 wires one is ground the other power, remove connector ac compressor then probe with test light between the two wire

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98 mercury trace no 12 v going to the ac compressor


check your fuse box for a blown ac fuse, fuse box usually under dash, sometime under the hood of the car usually on drivers side. bad switch?
check if you hot wire lead might be pinched and grounded out or broken wire between battery and switch

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If the compressor came on when you were testing it with a test light, it sounds like something is wrong with your ground for your compressor, and completely the circuit through your test light.

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I have a 02 lincoln ls . the air conditiong is not working . i took it to a local shop they check the compressor, fuses, relays, pressure swithches, all is checcking out good. They jump the compressor...


YOU COULD HAVE OPEN OR SHORT IN THE BLACK YELLOW WIRE GOING TO AC COMPRESSOR CYCLING PRESSURE SWITCH. CHECK FOR A SHORT OR OPEN IN RED YELLOW WIRES AT THE AC PRESSURE CUTOFF SWITCH. USE VOLT METER AND CHECK FOR VOLTAGE AT BOTH SWITCHES. PROBLEM COULD BE IN THE EATC MODULE THAT SEND POWER TO PURPLE WIRE THAT FEEDS THE AC PRESSURE CUTOFF SWITCH AND AC CLUTCH CYCLING PRESSURE SWITCH THEN FEEDS THE AC COMPRESSOR CLUTCH SOLENOID.

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Ac compressor not starting. added one can of 134R and no help. had a rebuild last year of the engine and has not worked since. Thinking it might be a wire some where.


Check for voltage at the AC clutch with AC on and engine running. If no voltage there, check voltage at AC clutch cycling switch.

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SOUND LIKE AC COMPRESSOR CLUTCH COIL IS OPEN.ITS GETTING POWER YOU HAVE A OPEN COIL CIRCUIT.

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AC Compressor not engaging on 2000 Chevy Impala. Fuses and AC relay okay. No power at compressor. Need wiring diagram. Also need to know if compressor requires 12v for operation. If not what should voltage...


When your R-134a runs too low it will NOT engage the compressor. You need to refill your a/c system before the clutch will engage, I also suggest finding the leak.

Apr 20, 2010 | 2000 Chevrolet Impala

1 Answer

Air compressor will not start, seems like a electrical problem, check fuses under hood and relay


the compressor is also controled by the coimputer. Disconnect the battery than reconnect it than try your ac to see if it comes on. if it does and it clicks on and off than you may be low on freon. Being low on freon will also keep the compressor from coming on because you have pressure switches that are in ac lines that control power to the compressor. you can disconnect the wires at the compressor and with the car running turn the ac on and probe the wire with a test light to see if you have power to the compressor. If you have power than chances are your ac clutch may be bad. Hope this helps leave a comment.

Apr 10, 2010 | 2005 Jeep Grand Cherokee

1 Answer

Charged AC on my suzuki and turned AC on but compressor doesn't engage. Not getting power to compressor. Ran hot wire straight from battery to compressor an still no luck. Is compressor bad? Any ideas?


Could be,but make sure the ground side of the compressor(wire)is grounded,if it is,the clutch coil on the compressor is bad,it will be cheaper,and easier,to replace the compressor with the clutch assembely.

Apr 02, 2010 | 2002 Suzuki XL-7

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