Question about 1999 Chevrolet Silverado 1500
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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Posted on Jan 02, 2017
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