97 Buick Regal climate control

driver side actuator for blend door is electric servo controlled. It could be jammed or computer sending it in wrong direction. Unit is located on driver side of heater case.

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There is a reason, and testing will reveal that.

I have the exact same problem. EXCEPT I don't have heated mirrors. Anyone else have any insight??

I am assuming you are talking about the blower motor , in the old days it was a resistor module that would go bad but on your buick its called an electronic blower control module and is mounted right by the blower motor under the passenger side dash.

the motor for the passenger side
blend door is shot

check the headlamp switch for a short

I had the same problem when i was working on my 1999 Buick Regal and had to disconnect the battery. I didn't reconnect in the same way that I disconnected the battery from the terminal and noticed that the driver side had no heat or air but the passenger side did. I then disconnected the battery again and reconnected it the same way and now have heat and air on both the driver and passenger side. Hope this helps. Good Luck!

This is a chronic problem on the LCD display for Buick Century/Regal cars with the climate control HVAC system. The problem is most often some of the resistors on the PCB will get a "cold solder" joint and need to be fixed by remelting the solder and adding a bit more fresh solder. Remove the unit from your dash and inspect all the solder joints. Chances are you'll see one of them that is "loose."