Join Date: Apr 2018
Own a Commander?: Yes
Model year: 2006
Trim Package: Limited
Power-Train: 5.7L V-8 Hemi
If 4WD - system: QD-II
I pulled back the rear trim panel and took a look at the rear HVAC unit. I see now why it says to remove the entire assembly to do the repairs. The blend door and mode actuators are basically touching the side of the vehicle, there is no chance of replacing them without pulling it from what I could see.
I figured that the blend door actuator was probably just sticking though, since it would eventually move to the set position after a while of driving. With the forward part of the panel pulled back and the engine running & rear AC on, I cycled the rear temp control repeatedly from hot to cold while banging on the actuator with a long pry bar. IT WORKED!!! I cycled it back and forth a few dozen times and it seems to be working properly now. I expect that it froze simply out of disuse.
This was probably not a permanent fix, but there's no way I'm going through all that trouble to repair the rear HVAC. What a stupid design by the way! Why not just make it a mechanical actuator, and WHY so difficult to replace???