Problem Description and Possible Solution
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.
Average mileage: 118,265 (45,000–216,000)
13 people reported this problem
My 2003 2500HD is blowing extremely hot air out of the drivers side vents and the air conditioned air flows perfectly fine out of the passenger side vents. The dual temperature guages are working but it continues to blow very hot air just on the drivers side vents. If I stop, put the truck in park, turn the engine off, and then restart the engine then it will blow the correct cool air from the drivers side vents after about 3 times or so of repeating that process. I just had the compressor replaced about 6 months ago and was working fine, but now this strange thing is happening and I am not sure of the diagnosis.
had to replace the heating actuator for the passenger side (duel control ) than the drivers side went, I have cold air in the winter and hot air in the summer, the local chevy garage , frenchies auto, wanted 400.00 dollars to replace it.