1992 GMC Yukon Q&A
1992 GMC Yukon Question: Heater blows cold air
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! - Bret Bodas
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?