Chrysler Forum - Chrysler Enthusiast Forums

I am Looking for Information or a Manual on disassembling and operations of the Heater / AC box for a 2007 Pacifica. I have the full Chrysler repair manual but it only tell you how to remove it. There is no information on the inside working/operation of the heater blend doors. My Daughter in laws Pacifica has one broken door and one we think is stuck. All the motors work OK. Would like to get this fixed before my Son returns from deployment
Also my local Chrysler Parts dealer tells me you can’t buy the inside parts separate. You have to by the whole heater box to get one plastic part. IS this true?? Are any parts available from aftermarket dealers?? Thank you