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.
Improper HVAC Temperature and/or Air Delivery Due to Failed Mode Door Actuator on Pontiac Bonneville
6 people reported this problem
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Hardly ever need to turn on the heat in Tampa, but I needed it one night recently and got nothing but cold air out of the vents. The engine was warm from a 90 mile trip, but still no heat. A/C works, THANK GOD!!
I'm heat dose not work power steering
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.