It don't matter what setting i have my ac on when i put it on it only blows out the door vents, rear vent and under dash.i cant get no air to come out of none of the dash vent.it blows cold out of the working vents so i know i got freon (2000 DTS)
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on the controls for you AC there is settings that send it where you want, floor, dash, vent, defrost. choose vent. Also notorious for vent doors getting stuck from dirt, leaves etc going down the breather under your hood on top the rear fire wall down the holes and clogging the louvers so they cant switch over. check the setting but if not, this is really a job for buick. pretty complicated and risky to mess with for the novice machanic.
The problem is either an actuator or the door associated with it. Sometimes the gear strips, especially when the system goes thru a recalibrate after power has been removed and reapplied. Below is a diagram of the locations of the actuators.
The first thing I would do is have the computer checked for trouble codes. The codes will point you in the right direction to look for the problem. The codes may be for something other than the vent problem. The air is directed thru the heater core and evaporator core and also to the correct vents by blend doors in the ductwork under the dash. They are usually controlled by small electric motors.
sounds like you have a bad blend door motor that is stuck in the middle allowing for all vents to blow air... locate the motor under the dash and remove it. manually move the lever and see if it changes the flow.. check for power at that motor to make sure your getting the signal from the dash then you'll have found your problem....
There is a blend door acuator which moves when u change your settings. Its a electric motor. Down under dash, Will need a mech and a heating and cooling diagram to find where the motor is,
The most common cause is a bad blend door actuator which controls air flow throughout the cabin. When air flow only flows from 1 section (either floor, vent, or defrost) it's an indication that the blend door actuator is either stuck or broken.
THIS PROBLEM IS CAUSED BY A FAILED PART CALLED A "AIR TEMPERATURE CONTROL BLEND DOOR ACUATOR MOTOR", IT IS LOCTED IN THE AIR DUCT AT THE BLEND DOOR APPROX CENTER OF DASH, IN MOST CASES THE DASH MUST BE REMOVED TO SERVICE THIS MOTOR..
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