Question about 1998 GMC Jimmy

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A/C compressor turns on intermittently, no cold

My A/C does not work in my 1998 GMC Jimmy. I went to add gas, but the gauge says it is full, if not, TOO full. The A/C compressor runs will run for 2-3 seconds, then off for 5 seconds. This cycle repeats continuously. Is there a reason why the compressor would not be cycled on full time when I turn the dial to A/C? Might it indeed be too full of gas and causing pressure issues?
Any ideas?

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  • robcurtiss3 May 28, 2010

    In my good old Haynes manual, I found that if you jump the low pressure sensor wire (on the accumulator) the compressor will run and you can then add gas. I added what was left of one can, then broke my I'll let you know what happens when I get more to add.

  • robcurtiss3 Jun 01, 2010

    In the end, breaking the hose/gauge unit I had was a stroke of luck, as it was incredibly inaccurate. I bought a big bottle of gas with a built in gauge. I was able to fill it to the proper level, which allowed the compressor to function properly!

    So in the end, a bad pressure gauge caused my issues. Thanks for the help!



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It is a possibility, go to the low side inlet valve and release a liitle bit of freon at a time and see what happens, do it with the engine off and start it up to test.

Posted on May 28, 2010

  • robcurtiss3 May 28, 2010

    After letting a bunch of air out, the compressor stopped engaging entirely. I tried adding gas back into the system, but without the compressor running, it wasn't going in properly.

  • Boneebone May 28, 2010

    Sorry, maybe you misunderstood when you let the freon out, let it out without the engine running, to add freon the engine has to be on and the compressor has to be on.

    How many cans did you add before it was full? When the compressor was cycling, was the air blowing out from the vents hot or cold? There is also a possibility that even though the clutch is engaging on the compressor, the compressor could be bad and not pumping freon into the system and circulating it.



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