Tiger Shark, we have had the same issues with the climate control system. Early symptoms included hot air coming out the passenger vent while cold air came out the driver's vent even though the unit was in the sych mode. Upon startup with the unit in the dash vent mode, it would immediately switch to defrost mode and the key pad would not accept changes. Chrysler Corp Service said "That is actually normal operation. It's to prevent a nasty blast of hot, damp air from hitting you in the face. The evaporator will cool a little then the system will switch to vent. Again this is normal." Odd that for the first 11 months we had the car, it didn't work that way. Finally, the 4.3 climate control system gave up and wouldn't accept any changes.
Last week Chrysler agreed to replace the A/C Control Head and as of today, it's working fine.
