Improper HVAC Temperature and/or Air Delivery Due to Failed Mode Door Actuator on GMC Yukon

One or more heater & AC (HVAC) temperature and/or air delivery mode door actuator may fail, resulting in improper temperature or air delivery. If this occurs, fault code(s) should be stored in the HVAC control module which should assist in diagnoses.

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Average mileage: 90,320 (20,600–200,000)
13 model years affected: 1992, 1993, 1994, 1995, more1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004
19 people reported this problem
3 people shared problem details
turn on the heat and it gets hot for awhile then turns still comes out all the vents when you hit the controls..put in a new theromsat
2004 GMC Yukon200,000
My air conditioning went out...had the actuator fixed...then my heat would not work....had that actuator fixed....cost me apprx $1,000.00- $1,500.00 total for both.
Ac and heat only blow out of the defrost still looking for solutions
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