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: 205,000 (140,000–270,000)
7 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
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