Imagine That…
Just got back from the GMC dealer. It seems the problem was with the “low pressure switch”. Hmm. Of course, I had to look it up on the web, and here is what I found at TrailerLife.com:
Air Conditioning (A/C) Inoperative/Intermittent, A/C Blows Warm Air (Replace A/C Low Pressure Cycling Switch) #03-01-39-007
2003 Cadillac Escalade, Escalade EXT, Escalade ESV
2002-2003 Chevrolet TrailBlazer, TrailBlazer EXT
2003 Chevrolet Avalanche, Silverado, Suburban, Tahoe
2002-2003 GMC Envoy, Envoy XL
2003 GMC Sierra, Yukon, Yukon XL
2002-2003 Oldsmobile Bravada
2003 HUMMER H2
Condition
Some customers may comment that the A/C system is intermittently inoperative or blows warm air.
Cause
An intermittent inoperative (open) A/C low pressure cycling switch may be the cause. This is an intermittent condition and temperatures may play a critical role if the vehicle is in the failed mode or operating as designed.
Of course, one little switch later and I am cool as a June bug in January.
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