Air door stuck on hot?

[Chevrolet1]

Vehicle: 2005 Silverado crew cab LT with dual zone HVAC

Issue: It was cold this morning, so ran the heater for a while then, when it warmed up, turned both driver and passenger knobs from "90" to "60" degrees and switched air flow from floor to dash vents. But the air stayed hot and didn't change to the ambient temp like they should have. Made the stops I needed and, even after turning off and re-starting the truck a few times as I made my stops, hot air continued to come out of the dash vents. This actually happened to me several weeks back, but it was corrected the next time I drove the truck (which is generally about twice a week).

 

Anyone else experienced this? If so, what's the cause and resolution?

[txab]

You might try the HVAC recalibration procedure:

 

 

 

Remove the HVAC/ECAS fuse for a minimum of 10 seconds.

Re-install the HVAC/ECAS fuse

Turn key on, but do not start. Make no adjustments to HVAC controls at this time

Wait 40 seconds for the HVAC control module and actuators to re-calibrate.

 

I've always had the best luck at this point by turning key off. Removing key and closing the door. (Signals the BCM of a completed driving cycle)

 

Then climb in in, start and drive.

[Chevrolet1]

Thanks txab, I'll give that a try this weekend.