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Thread: Air Conditioning not getting power

  1. #11
    I checked all fuses and they are good.

    Thanks for everyone's help
    1997 GMC RCSB
    LS6/T56

  2. #12
    anybody else know what I can do
    1997 GMC RCSB
    LS6/T56

  3. #13
    Join Date
    Nov 2003
    Location
    Denton Texas
    Posts
    20,540
    You could just tie into the trigger wire with a switched power wire so that its always on with the ignition. When winter comes along disconnect the wire or put a switch under the hood to turn it off. It's rigging but sometimes its your only choice short of paying $80/hr for the dealer to look at it and tell you they don't know what to do but replace the whole harness.
    See my truck data in the "My Garage" section here... http://www.ls1truck.com/forums/my-ga...tml#post191709

  4. #14
    Thanks RedHearbeat

    Does anybody know what wire that is and if the compressor would cycle if I do it this way?
    1997 GMC RCSB
    LS6/T56

  5. #15
    Join Date
    Nov 2003
    Location
    Denton Texas
    Posts
    20,540
    Nope, wouldn't cycle. Have you traced all the wires back into the cab? Have you replaced or at least checked the relays that control the a/c behind the glove box insert? Have you replaced the a/c control module on the dash?
    See my truck data in the "My Garage" section here... http://www.ls1truck.com/forums/my-ga...tml#post191709

  6. #16
    There are relays behind the glove box?

    I thought the only ones are under the hood.


    Is the control module the one with the buttons and knobs for the fan and heat/AC controls? If so I have not replaced it, pretty pricey.

    Is there a timed switch(so it will cycle) I could buy and run it directly to the compressor?
    1997 GMC RCSB
    LS6/T56

  7. #17
    Join Date
    Aug 2008
    Location
    North Texas
    Posts
    12,078
    Cycle time is determined by low side pressure.

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