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

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.

RepairPal Verified
Average mileage: (–)
3 model years affected: 2002, 2003, 2004
3 people reported this problem
0 people shared problem details
Related Items:
The muffler heat shield may become loose on the muffler causing a rattle or popping noise. Our...
The CD player may fail due to an internal fault with the radio. Our technicians tell us that i...
One or both secondary air injection check valves may become restricted causing poor air flow re...
The steering wheel position sensor may fail, resulting in the service stability message being d...
The fuel pump may fail causing the engine to stall and not restart.

Related Content