Mechanics

HEATING OR DEFROST PROBLEMS

2008 GMC Envoy • 6 cylinder 2WD Automatic • 440,000 miles

Why does the heat/defrost stay on sometimes in my 2008 GMC Envoy evn though the ignition is off and the keys are out?
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AWesson
February 1, 2011.



You have a problem between this two: HVAC control module or the blower motor control module


Rasmataz
Feb 1, 2011.