1992 GMC Yukon Q&A

1992 GMC Yukon Question: Heater blows cold air

Is there a heater water control valve and how do I replace/check it? Where is it? -
Answer 1
First of all, make sure the coolant level is OK, and the engine is reaching normal operating temperature. Your vehicle has a temperature blend door, and it is activated by a little electric motor called an actuator. Check out autozone.com for instructions! -
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2004 Yukon. a/c cold in rear but blows severe hot air out of front like coming through heater core. Stopeed over night and coll air worked again. Any ideas?