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1992 GMC Yukon Question: Heater blows cold air

 

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yukontm, Gasoline, Geyserville, CA, February 20, 2009, 15:03
 Rookie

Is there a heater water control valve and how do I replace/check it? Where is it?

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  • Answer #1

    Bret Bodas from RepairPal Test Shop, February 20, 2009, 15:43
     Master

    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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