FYI- had same issue, HVAC module needed to be re-calibrated. The HVAC PCM door setting and the actual door setting didnt match. The dealer said becuase i disconnected my battery cable. Dont know how true that was tho. I had to do it b/c my twilight sentinel kept sticking on and would not go off for nuthin. it happened a couple of times.
be careful playing wit it too much before you get it re-calibrated. that rod they are talking about has a little plastic white gear that opens the vent door and it will break teeth if you play with it too much out of calibration. mine eventually stripped and the doors were all screwed up until i got it replaced. That was a lot more expensive then getting teh PCM recalibrated
to re-calibrate they just stick teh computer on the car, look at the real door position, then the door position the PCM thinks its it, if it doesnt match, they move the door to the right percentage point to match the PCM reading.
hope that helpss....