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.
Improper HVAC Temperature and/or Air Delivery Due to Failed Mode Door Actuator on GMC Sierra 3500
Average mileage: 213,795 (140,000–270,000)
8 people reported this problem
2004 GMC Sierra 3500 140,000 mi, Visitor
duel zone AC, one zone will work correctly and the other will blow hot air
2005 GMC Sierra 3500 231,386 mi, Visitor
A/C sending hot air. This just happen could not cool. We turned engine off for 20 minutes or so, upon restart we had cool air again. What needs to be done to repair the problem? Still gets plenty warm in Tucson in the fall month, still need A/C. Thank you for your time. Norma R. Tucson,z
Temperature is stuck below 0 degrees and I cant switch on my A/C in summer!