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Thread: Air Conditioner compressor won't engage

  1. #1
    Senior Member bfloyd's Avatar
    Join Date:  Nov 2014

    Location:  Lebanon, Tennessee

    Posts:    323

    My VIN:    3294

    Air Conditioner compressor won't engage

    Took my car out on Saturday to a friends housewarming party and the temps here on Saturday were in the high 70's. Since the car had been sitting outside all day, it was pretty warm so we decided to switch on the AC. Nothing happened. Typically when I switch on the AC you can instantly hear the cooling fans kick on and feel the compressor kick in. We got nothing. Don't know if it's an electrical thing or a compressor / refrigerant thing. The whole AC system is less than two years old. I replaced the compressor, hoses, accumulator, condenser, etc. in the summer of 2016 with an all new R134 system.

    Not sure where to start?
    Barry Floyd
    Lebanon, Tennessee
    VIN 3294 - Aug. 81

  2. #2
    Senior Member Bitsyncmaster's Avatar
    Join Date:  May 2011

    Location:  Leonardtown, MD

    Posts:    7,083

    My VIN:    03572

    Most likely your low an refrigerant. Put some gauges on the AC to find out. You need at least 50 PSI for the compressor to kick on.
    Dave M vin 03572
    http://dm-eng.weebly.com/

  3. #3
    Delorean Guru
    Join Date:  May 2011

    Location:  Northern NJ

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    Quote Originally Posted by Bitsyncmaster View Post
    Most likely your low an refrigerant. Put some gauges on the AC to find out. You need at least 50 PSI for the compressor to kick on.

    The quickest and easiest test is to stick a paper clip into the plug that goes to the low pressure switch. If the compressor clutch engages then you can assume you have a leak and need some refrigerant. DO NOT run the A/C more than a moment with the switch bypassed.
    David Teitelbaum

  4. #4
    Senior Member bfloyd's Avatar
    Join Date:  Nov 2014

    Location:  Lebanon, Tennessee

    Posts:    323

    My VIN:    3294

    Thanks guys, that gives me a starting point to check.
    Barry Floyd
    Lebanon, Tennessee
    VIN 3294 - Aug. 81

  5. #5
    Senior Member
    Join Date:  Dec 2016

    Posts:    205

    If your door lock warning light is not working, check fuse 10. It also provides power for the AC mode switch.

    Ron

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