Do you have dual zone cooling? If so, you have a bad air blend motor. I had to replace 3 on my 07 Impala and the basic geography of the part locations are the same for your Lucerne. There is one to the left of the radio well back into the dash, one to the right and one by the passenger side kick panel, near the door hinge. They are not for the faint of heart to replace. I had to replace mine because they were clicking and sounding obscene. They run about $25 each. Determine which is faulty using this rule of thumb:
Drivers side uncontrollable: replace far left blend motor
Passenger side uncontrollable: replace one just to the left of the glove box.
If you cannot switch between outside air and recirc, replace the one to the right of the glove box.
The blend control motors look eerily similar to a quartz clock movement you'd find in a hobby store, however, that is where the similarity ends.
Hope this helps
I had this happen also in my daughters 2008 Lucerne and just replacing the thermostat solved the problem. The check engine light showed it was not working.
SOURCE: my 1997 buick park avenue
U need to replace the air temperature control blend door actuator motor, this requires removing the dash to access the motor for the blend door.
SOURCE: 2000 buick century blowing hot air on one side and
The temperature actuator has gone bad. You will need to replace and have it recalibrated. You could try and disconnect the battery for a few hours and see if it will reset it's self. But you will be in the same boat before too long. And will eventually need to replace it.
SOURCE: a/c blows hot air on drivers sde
The actuator door on the driver's side is out of position and needs to be reset. Remove the negative battery cable for 1/2 hour to reset the computer. Start the HVAC system and you should be able to hear the door adjusting itself and cold should come out of the driver's side vent.
SOURCE: air conditioning in 2000 lesaber
Vent door between the two sides isn't opening or the flex hose going between the two is off.
SOURCE: 2003 buick lesabre AC problem
You have to find the motor that controls the blend door and open it manually to find out which one is bad there are 3 blend doors on the HV/AC system one will be where the heater core is. The other will be between the vented air and AC? heating system then the third door will operate vents in dash and defrost condition. If you have someone operate them AC system heating system and watch the blend door motors, the one you find not moving will be the one that has the problem. They have vacuum and electrical motors, if it is a acuum motor you can move the door manually with your hand, if it's electric you will have to disconnect the rod by removing the pinch clip off of the rod.
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