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How do I replace the electroni air flow actuator on a 1999 Buick Park Avenue?


The two little electric

The two little electric motors that move the blend doors to mix the hot air and normal air at the right side.
They have little plastic vacuum tubes that run from the programmer (heater computer) that's bolted on the corner of the heater box with one of the electric actuators inside.
f you take off the two plastic sound shields right and left, and spend some upside down time lying across the seat and get your head underneath the dash, you can check operation of lots of these parts by changing the heater controls with the key ON and the motor running to provide vacuum for those motors.
These motors are held in place by three small screws. Note the position of the actuator drive (part of the actuator which moves) before removing the actuator.

have you checked the fuses

have you checked the fuses first?


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