Question about 2005 GMC Sierra

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2006 1500hd Sierra, my a/c will not cool on occasion after it runs for awhile and the compressior isn't on. It seems to be the internal thermastat that makes it think it's up to temp. But, even when it's on manaul, it will stop cooling. Can it be low or would the compressior still come on? I don't know how to check the internal thermastat if that may be causing the issue.

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Thermostat no, I would have some gauges hook up on your a/c system, could be low on freon or a restriction causing to a/c compr. to turn off, low or high freon pressure will cause your a/c compr. to shut off and come back on, have it check with gauges.good luck.

Posted on May 14, 2010


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