Quote:
Originally Posted by j cAT
temp control is a stepper motor issue most times. this moves the temp door to change air vent temps. with your vehicle you have 2 of these driver and passenger side.
on my silverado I found that the temp door stepper motor was sticking due to it binding on the vent housing so I installed washers very small to give the shaft a little space so it moves with no binding. IT could also be it is a bad temp door assy since it is over 10yrs old now ..
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Thanks for the suggestion. Gave me some ideas to research. It appears that it is a blend door actuator. I have found multiple reports of the same issue all being resolved by replacing that actuator.