I realize that this thread is now old, but I really want to express my appreciation to the people that contributed.
Especially lfhoward and ajohns1288 (previous thread
viewtopic.php?f=104&t=84546).
I'm just finishing up replacing my Distribution Box on my wife's 2012 KK. It got stuck on defrost-only last Spring.
At the time, I diagnosed the problem and found stripped gears on the mode-door mechanism.
I forced the mode doors to the "Upper-Vent"-only position, and removed the gears that move the doors.
The blend door still worked fine. The actuators appeared to be OK.
As cooler weather approaches, I decided to go for it since she'll probably want to have a defroster when ice and snow arrive.
If not for this thread, and the other one I mentioned, I would have had a much more difficult time doing the job.
I have the "Service DVD" but it's very sketchy, and has a few errors, and lots of omissions.
Also, I would like to add a few things that I learned from doing this ugly job that may help the next victim that tackles it.
Not sure if this is the best place to post them vs the other thread.
I guess I'll post them to the other thread,
viewtopic.php?f=104&t=84546since it seems to be a little more comprehensive. So anyone seeing this, check out my additional posts there.
Thanks again.