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 2500
Average mileage: 118,265 (45,000–216,000)
12 people reported this problem
6 people shared problem details
2003 GMC Sierra 2500105,326Visitor
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.
2004 GMC Sierra 2500125,000Visitor
ac will work and then blows hot air, restarting truck sometimes works
2004 GMC Sierra 2500216,000Visitor
A/C switches from A/C to heat on drivers side. I have to turn truck off and restart to resume the proper operation of A/C then it may go all day or 2 minutes till it happens again.
1999 GMC Sierra 2500100,000Visitor
Heater blows cold or cool at times. Stopping and starting the truck works to correct the problem at times. Truck currently has 138000 miles and I have not repaired problem at this time.
2004 GMC Sierra 250045,000Visitor
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.
2004 GMC Sierra 2500Visitor
Only the drivers side is affected of the duel climate control. I have not yet fixed the problem, disconnecting the battery seems to be a short term fix.
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