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.
Car Problem Reports
GMC Yukon Denali Heating and AC Temperature and Air Delivery Mode Door Actuators May Fail
GMC Yukon Denali Problem
Average Mileage: 104,250 mi (57,000 mi - 150,000 mi)
Visitor, 2004 GMC Yukon Denali, 57,000 mi
HVAC is blowing air out defrost and floor. Will not switch to vents.
Visitor, 2004 GMC Yukon Denali, 140,000 mi
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