Question about 2003 GMC Yukon XL

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2001 Gmc yukon xl a/c blowing hot most of the time but some times blows cool for a little while. pressure gage shows 100+ when I am told this should be between 25-65. The compressor does not seem to be coming on. all fuses and relays are good

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  • captjeff72 Jul 29, 2009

    The low pressure switch that shuts off the compressor when the charge is low is faulty



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The earlier GM trucks had a problem with the a/c systems
Compressors are junk, but this will usually break the a/c belt, and make a horrible noise right before that.
the pressure you have listed is not much help, there is a high and low side pressure. If they are both the same, then the compressor is not on or is not pumping (broke). The early yukons/suburbans/tahoes also had a problem with the a/c cycling switch. If yours has a brown band, replace it.

At Idle (depending on outside temp) Low pressure should be about 40 psi at idle and high side about 220....again this can change greatly by outside temp.
Another thing you may want to look at is of course a leak in the system, make sure its fully charged, and check the fan clutch.

Posted on Aug 07, 2009


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