Question about 1999 GMC Suburban

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My 98 burban ac wont work.compressor is new dont here it engage wires are good fuses and relays good .theres enough freeon in system. im baffeled

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  • bigkoz1 Jul 21, 2009

    no i didnt ill check that out tommorrow, thank you

  • Mike Butler
    Mike Butler May 11, 2010

    Tried jumper on pressure switch by firewall?

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  • Master
  • 417 Answers

Hi,
you can try and jump the high pressure limiter switch on the expansion tank, sometimes they get a bubble. Its the silver cylinder looking thing near the firewall. follow the cooling pipes from the compressor back to the tank if theres a question, on the top or near it will be two wires going into it, undo that switch housing connector and hook a jumper wire up there. switch may have to be replaced there. dont run that for any length of time with the jumper, just to diagnose.
good luck
J

Posted on Jul 21, 2009

  • Jude Meredith
    Jude Meredith Jan 19, 2010

    hi,


    that switch assembly may be right on one of the refrigerant lines, sorry ford guy


    jm

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