I HAD THE SAME PROBLEM IN ANOTHER BUICK . IT WAS THE COMAND MODUEL BEHIND THE GLOVE COMPARTMENT, THE SPRINGS THAT OPEN AND CLOSE AIR FLOW WINDOWS
THAT RUN FROM THE UNIT WON'T CHANGE FROM HEAT TO AIR TO YOUR VENTS.YOU NEED A NEW COMAND MODUEL OR HAVE IT REBUILT . IT OPENS AND CLOSES THE VENT DOORS . I GOT MINE REBUILT FOR $50.00 FROM A GUY THAT WORKED AIRCON LINE @GM
GARAGE QUOTED ME $650.00 HOPE THIS HELPS.
GOOD LUCK
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I have the opposite problem The heater is on full time. I can not adjust temp or shut it off or turn air on it is just on high heat full time. Thank goodness I can turn the fan off. To add to this both right side windows will not roll down. Someone has suggested to me that it is a computer connection problem. Please help.
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