Yes, I installed the Pioneer AVIC-F920BT into my CX 9 modelyear 11.
I have similar problems. The blower in the front is working only after about 40 minutes driving time. I wasn't at the service but after your mail I'm a bit confused. I do not understand where is the context between the navigation unit and the blower !!
What about your blower, does he work If you start the car ?
Have you the problem only with the AC or generally ?