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Discussion Starter #1
Rear HVAC temperature control doesn't work properly. I sometimes can get it to go to hot or cold, but it doesn't switch properly between them.

I have narrowed this down to the rear blend door actuator. Service manual says I need to disconnect both the AC and coolant lines and remove the whole assembly!!! I'm wondering if I pull the rear trim panel if I could get my hands back there far enough to replace it without pulling the entire assembly and disconnecting the system. Looks like it's only two screws and a small connector!

Has anyone tried this?
 

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Discussion Starter #2
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???
 
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