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I have an 07 Aspen with a problem diverting between dash defrost/bilevel and floor. I've tracked the issue to the mode door high up under dash above gas pedal. I tested the door by turning manually and it works. I also tested the actuator both on vehicle with scan tool and on bench. All good.
The bad... There's a broken bushing or something right where the motor gear mates to the shaft. It was too broken to know what I was looking at.
Does this make sense to anyone? mode door actuator 07 Aspen
Yes, you can get to the actuator motor for the mode door without taking anything else apart. My problem was that the corner of the mode door that attaches to the actuator was broken off, so the mode door was just dangling in a downward position. We were able to disassemble the dash, epoxy the mode door back together, and reassemble the whole thing. I did a write-up with pictures for it on DodgeDurango.net.. They actually pinned it to the top of the "Durango Discussions 2004-2009" section, so it's easy to find. You can also search for it under my user id - I used the same one for both forums - LizzR. I hope this helps someone out there!