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
HVAC is blowing air out defrost and floor. Will not switch to vents.
Cold air blows out drivers side and hot air out passenger side when the heat is put on
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.
blower motor for fronton and off some times and temp switches from hot to cold
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.
driver side blows hot air while on a/c actuators had to be replaced.
AC blows hot....says there is plenty of freon
Hot air will blow at drivers side, while cold air blows at passengers with AC on. Shutting off and restarting has generally resolved this.
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!!!!
The AC and heat will only blow WHEN driving and out of the face vents. The defroster etc won't click on.
Rear have not working. They said it needs the rear HVAC control unit and mode door actuator!$850
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.
only can get fresh air, due to actuator not working
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
electrical problems- door locks, ac/heater, lights, all going out and replace.. reapeat