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Thread: AC Clutch not engaging

  1. #16
    basscatt's Avatar
    basscatt is offline Cadillac Owners 10000+ Posts
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    Re: AC Clutch Not engaging

    Quote Originally Posted by Ray Slay View Post
    The PCM will shut down the compressor clutch when low refrigerant is detected. Not saying you have that problem. If so you will have to unhook the battery ground cable and reboot before the compressor clutch will again engage. My personal experience on this one. Only at that time will you be able to recharge the system.
    -------------------------
    if there was low refrigerant - it would set a LOW REFRIGERANT CODE -

    you will have to unhook the battery ground cable
    and reboot before the compressor clutch will again engage

    or just go into the computer and clear the codes -


  2. #17
    bigo93bronco is offline Cadillac Owners Member
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    Re: AC Clutch Not engaging

    Just got back from another WTX work trip, is there any method for testing those Freon temp sensors? I noticed that if I unplug the one closest to the brake booster (KOER), both fans come on HIGH and stay on until I replace the connector. I have checked for continuity between the cavities in the connector(s) to as far down the harness as I can get, and everything has checked out to that point. I'm leaving the battery disconnected at the moment to clear out the "A" codes. I want to see if they come back or not, and clearing PCM codes doesn't seem to remove them

  3. #18
    bigo93bronco is offline Cadillac Owners Member
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    Re: AC Clutch Not engaging

    UPDATE

    I disconnected the battery for awhile and cleared out the A011 and A012 codes (they have NOT come back), but the compressor still will not engage. Any suggestions?


    The A011 and A012 were probably just from me unplugging the connectors while the engine was running last week (just making sure they were clean and fully seated)

  4. #19
    basscatt's Avatar
    basscatt is offline Cadillac Owners 10000+ Posts
    Automobile(s): 2003 DHS - two-2002 DHS's, 2003 SLS, 1995 Sedan DeVille, 1989 Coupe DeVille
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    Re: AC Clutch Not engaging

    Quote Originally Posted by bigo93bronco View Post
    UPDATE

    I disconnected the battery for awhile and cleared out the A011 and A012 codes (they have NOT come back), but the compressor still will not engage. Any suggestions?


    The A011 and A012 were probably just from me unplugging the connectors while the engine was running last week (just making sure they were clean and fully seated)
    -----------------------
    check for codes - and read #2

  5. #20
    bigo93bronco is offline Cadillac Owners Member
    Automobile(s): 1994 Eldorado Northstar
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    Re: AC Clutch Not engaging

    never mind, problem solved. It was a bad low pressure sensor. Voltage to one side with nothing on the other when you know their is pressure in the system= the problem.

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