Question about 1999 GMC Sierra
Fan is blowing but no heat comea out
Mine had this pboblem. took it to gm dealership. they wanted $700 for new box. i took it home to chech it out myself and found an ink pen had got through vents and had the heater to defrost door fouled. fixed it in 20 minutes
Posted on Jan 15, 2009
Does the temperature guage go up to normal if so probably either a bad blend door motor or broken blend door or heater core cloged you can check the lines if one is cooler than the other then it is most likely the cause
Posted on Dec 31, 2008
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Posted on Jan 02, 2017
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