Question about 1999 Chevrolet Silverado 1500

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Air conditioning This winter I could only get cold air conditioned air to blow out my vents, then one day magically, I had heat...now that summer is here, I ONLY have heat...even on the "vent only" setting...HELP!!

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  • Chevrolet Master
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Sounds like the linkage in the dash controls are backwards or mislabeled relay was put in vehicle which has opposite properties of which your describeing
locate the control relay and or linkage check this first then replace the control relay cause during the cold months the relay freezes open or shut and then when moisture disapates is creates rust in the relay which gives it a bad point making things reverse

Posted on Jun 13, 2008

Your heater control module needs replace. the controls u see on the dash is all one big module.

Posted on Oct 22, 2008

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