My car wont blow air outof the defroster vents. on 1997 Buick Park Avenue

I understand the idea of dampers and actuators. Is there a drawing available that shows the different dampers and their locations.

by in Snowflake, AZ on December 30, 2012
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1 answer 2 comments
ANSWER by , December 30, 2012
you may have a small vac leak under the hood at your vac ball,start there and ck hoses thru firewall to controller
COMMENT by , December 30, 2012
where is the vacuum ball?
COMMENT by , December 30, 2012
under hood on pass side inner fender i believe. its a 3" blk ball with 2 vac hoses attached to it,follow the hoses and look for breaks or cracks