Question about 2001 GMC Sierra 1500HD

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2001 gmc 1500hd 6.0 liter ac wont come on when it is hot outside but if it is 75 or less it comes on

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Have the system diagnosed by a qualified shop. AC only happens at a certain system pressure for a given ambient temperature. There is a chart and the tech will refer to that, and not just "throw in" more refrigerant.

Posted on Oct 15, 2010

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