Yukon Denali

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

Problem Description and Possible Solution

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.

Problem Data
RepairPal Verified
Average mileage: 126,217 (55,000–270,000)
9 model years affected: 1999, 2000, 2001, 2002, more2003, 2004, 2005, 2007, 2008
39 people reported this problem
Viewing 1 - 17 of 17 comments
Ac on drivers side gets hot air while passenger side gets cooled air. If turn car off & restart it some times works normal
While the A/C is turned on MAX and the temp is 60 degrees, the vents will go from blowing ice cold air to blowing hot air.
Blows hot air from ac about two to three times a week . Sometimes can cut off car then occasionally resolves issue for a period of time . This should be a recall!!!!
Ac and heater blow on defrost and floor but not front. When I push the button to switch from floor, to face, to floor the air does not come out at the face it blows harder at the feet? When the arrow shows that it should be blowing at the face it is just blowing at the floor. I can switch between floor and defrost but not to front/face? This is with the heat or ac on.
Hot air will blow at drivers side, while cold air blows at passengers with AC on. Shutting off and restarting has generally resolved this.
The AC and heat will only blow WHEN driving and out of the face vents. The defroster etc won't click on.
while driving the air automatically goes from AC to hot air. goes back to normal only after i shut car off and turn back on.
My heater cools when I want heat and my A/C heats when I want cooling. I have had the motor doors replaced once before at 77,000. It not is occurring again.
This is terrible. Dead of summer, and the a/c turns to blazing hot heat... I followed a reset process researched online involving the removal and reset of the AC fuses, and setting cycles. still not exactly right