Question about 1999 Buick Park Avenue
Did you ever figure anything out with your vents? I have a 98 that has the same problem
Posted on Mar 21, 2014
Check for a vacuum leak in the hose going to the heater controls. Goes from engine compartment, through firewall, into dash to control head. Also, has a vacuum storage canister under hood. When system fails, it defaults to defrost.
Posted on Jul 30, 2009
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Posted on Jan 02, 2017
This recently happened to my mustang and I found a broken vacuum line that connected to a "vaccum block". I'm not sure of the name but if you follow the vacuum line from the master cylinder it will lead ya right to it!
Posted on Jun 24, 2009
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