Question about 1998 Buick Park Avenue

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HVAC air flow control

1998 Buick Park Ave. HVAC air flow control lights up and lights change from "floor" "mid" "windshield" but the flow itself does not change. It stays on "windshield" all the time. For a week or so it sounded like it was laboring to move the "flap" in the flow tunnel. How do I get to it, and how do I fix the problem? Please help.

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This is caused by the actuator mounted on the right side of the ducting under the dash on the right.
It is probably a cracked/split gear within the actuator housing.
The actuator is held on by two 5.5mm self taping screw bolts. the acuator itself is held together
by 4 posidrive screws. Carefully remove the actuator, undo the screws lift off the cover and inspect the n ylon gears looking for split/cracked gears.
Repair and replacement in reverse order. Do not power up the actuator until it is fully re-installed.
It is difficult to re-install if the acuator control is not in the neutral or horiztional position.
NB. removal & re-installation is difficult unless one removes rh side ducting and glove box (7 bolts)
and unclip the electrical circut box to the right of central duct-box.

Posted on Apr 28, 2009

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