2013 LTZ HVAC Mode door actuator Issues

[STU22]

So control unit works in another vehicle, but not yours?

Might need to find someone with a good scanner as previously mentioned..

Odd that it varies depending on blower speed.
So if you wait ten minutes and turn the blower to low, there's no problems?

I can stop and turn the vehicle off. let it sit for a while say 30 minuets start up and all will be fine for an hour or so. I have left the vehicle running and observed the mode door actuator moving to comanded poditions with no change. I have verified that the recirculation door is working properly. I have verified that the blend doors are not the cause. I have removed the actuators and tried to manually recreate the condtion with no luck. I do not have much of a scanner but it does not show any codes in the hvac or body control sections.

 

[mikez71]

I wonder if the doors are self adjusting due to the numerous temp sensors?
Looking at the diagrams, I see 5 temp sensors up front.
Left/right floor duct, left/right panel duct, and front passenger air temp. Perhaps one of the sensors are not reading properly?

Or your scanner is unable to read all available codes? idk...