I have a 2001 Stratus ES with an AC control panel issue, the AC works intermittently. When it is not working, the rear window defrost doesn't seem to work either. The fan works fine, redirection to the various vents is good but the system just blows warm air... Sometimes works when I first start the car but won't work later on. I have read about recalibrating the control head but can't find the proceedure online anywhere... anyone out there see this before?