Question about 2004 GMC Yukon
This is probably due to a faulty blend door or blend door actuator. The blend door is a device inside the dash that directs the air flow to the desired vent. Sometimes they will fail, but usually is an actuator. Unfortunately, you will have to remove the dash to see if this is the problem. If you have never removed the dash on a Yukon, you are in for a very big job. Here is also some good information
Posted on Oct 15, 2010
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Posted on Jan 02, 2017
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