Question about 2005 GMC Yukon Xl Denali
Sounds like the heater control valve/actuator. Should be under the dash mid to passengers side. It connects to the blend door inside the box. It opens and closes from the control on the dash. Local auto parts should be able to tell you where it is exactly. Hope this helps, Mike
Posted on Jan 14, 2011
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Posted on Jan 02, 2017
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