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 Actuatoron GMC Sierra 3500
Average mileage : 140,000 (140,000–140,000)
6 people reported this problem
2 people shared problem details
2004 GMC Sierra 3500140,000Visitor
duel zone AC, one zone will work correctly and the other will blow hot air
2001 GMC Sierra 3500Visitor
Temperature is stuck below 0 degrees and I cant switch on my A/C in summer!
Changed battery. Now ac switch won't change from defrost to face or feet setting. What is the p...
Lights flash, but don't stay on and the seats don't heat up.
The heated seat indicator comes on and I shut it off and it constantly comes back on automatica...
I've never heard of this .the only way to cut it off is to pull fuse under hood.other wise it w...