I've run into similar problems with an 03 where the climate control intermittently goes off the deepend or when the vehicle is powered down (battery replaced). Each time the dealer told me sounds like the HVAC needs to be recalibrated. That'll be $200. The last time they told me I needed to replace the actuator. That'll be $1200. That was enough for me.
After a bit of googling I found instructions on how to recalibrate the actuators. Try this and see if it works:
The HVAC control module will relearn the actuator limits whenever power is disconnected and re-connected to the module.
Use the following steps to perform the calibration update:
Turn OFF the ignition.
Remove the battery positive voltage circuit fuse of the HVAC Control Module.
Important: The scan tool must be disconnected from the vehicle to properly perform the calibration procedure. If a scan tool is connected before this procedure is completed, then new calibration values will not be stored.
Important: Failure to wait 60 seconds will not allow the HVAC control module sufficient time to clear the old calibration values.
Wait 60 seconds.
Install the fuse.
Turn ON the ignition.
Wait 60 seconds before installing a scan tool
Sunday, August 9th, 2009 AT 8:11 AM