GMC Sierra 2500 HD
Report: Heating and AC Temperature and Air Delivery Mode Door Actuators May Fail
GMC Sierra 2500 HD Problem
Average Mileage: 100,335 mi (36,000 mi - 205,000 mi)
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.
Visitor, 2006 GMC Sierra 2500 HD, 83,000 mi
When A/C is turned on, occassionally blows hot air instead. Restart of the engine will usually solve the problem.
Visitor, 2004 GMC Sierra 2500 HD, 63,000 mi
passenger side blows out hot air when should be blowing cold air
Visitor, 2001 GMC Sierra 2500 HD, 115,000 mi
Poor airflow. Does not transition through upper vents when selected.
Visitor, 2006 GMC Sierra 2500 HD, 72,566 mi
heater actuator will not switch to defrost or floor
Visitor, 2006 GMC Sierra 2500 HD, 113,000 mi
Blows cold air on driver's side and hot air on passenger side. Should heat both sides.
Visitor, 2003 GMC Sierra 2500 HD, 67,800 mi
Air only comes out dash vents. Changing to floor or defrost switch position does not change air flow.
Visitor, 2006 GMC Sierra 2500 HD, 205,000 mi
Bought used and wasn't told of the problem.....didn't need defrost until two days ago (2 months after purchasing)and it's stuck on floor and panel vents. Will not go to floor only, defrost only, or panel vent only.
Visitor, 2005 GMC Sierra 2500 HD, 154,000 mi
ACTUATOR AND DASHBOARD CONTROLS HAVE BEEN REPLACED, BUT STILL HAVE THE PROBLEM ON THE DRIVER'S SIDE.
SOMETIMES HEAT/COOL WORKS OK, OTHER TIMES DRIVER'S GOES TO FULL HEAT.
Visitor, 2006 GMC Sierra 2500 HD, 36,000 mi
Sometimes the middle vents work on my HVAC system, sometimes they don't. 2006 GMC Sierra 2500HD 4x4. I bought this truck new and it has never been abused or used hard.