GM Repair Problems? Ask GM Repair Expert Now.
If the re-learn procedure did not work, or did not last, the more common problem here will be the Air Temp Actuator. It's located under the center/driver's side of the dash. If you have a center console in the vehicle, it will need to be removed to gain access. Inspect the electrical connector and wire harness for any loose, broken or damaged wires. If the visual inspection checks ok, remove the Actuator and turn the nib by hand. The temp output should now be correct. If not, the problem lies internal of the HVAC housing. It will need to be removed, opened and the air door repaired as needed. If the temp is correct, replace the Actuator. If you found this answer helpful, please do the right thing and help me by leaving a rating using the "stars" at the top of the page or click 'accept'.Rating or accepting my answer does not cost you extra. It allows me to be credited for this Q&A. If you cannot rate or do not see where to rate, please let me know!