One or more heater & AC (HVAC) air delivery and/or temperature mode door actuator may fail. This can result in incorrect air delivery or temperature. If this occurs, fault code(s) stored in the HVAC control module should be available to assist with diagnoses.Google+
Car Problem Reports
Pontiac Bonneville Heating and AC Temperature and Air Delivery Mode Door Actuators May Fail
Pontiac Bonneville Problem
Average Mileage: 158,500 mi (122,000 mi - 195,000 mi)
Visitor, 2003 Pontiac Bonneville, 195,000 mi
My drivers side blows hot air when on a/c and the passenger and rear blow cold air. Just recharged the a/c and made the problem worse.