Question about GMC Denali
Hi, Sounds like your actuater for your heater box damper is bad. Its munted under the dash over the center hump. you will have to remove the cover that goes the length of the heater box to find it. The actuater motor should move back and forth with the temp knob going from cold to hot.
Posted on Aug 25, 2010
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Posted on Jan 02, 2017
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