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2002 GMC Yukon Question: What makes the heating system not switch back and forth from heat to air?

 

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mechanic5747, Clarksville, TN, April 22, 2014, 12:34
 Rookie

If you have the heat on will not switch to air but if you switch and then shut the engine down for 3 or 4 hours it will switch.

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  • Answer #1

    G. T. Service Center (4196 Answers) , Stephenville, TX - (254) 638-3236
    ProfessorG April 22, 2014, 16:41
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     Master

    Sounds like a possible temp/blend door actuator. It can be scanned with a professional scan tool to verify the fault.

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