Question about 1999 Buick Park Avenue

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Nothing blows out dash vents, but will blow out thru defrost nad floor vents on 1999 buick PA with dual auto air controls

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Did you ever figure anything out with your vents? I have a 98 that has the same problem

Posted on Mar 21, 2014

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  • Buick Master
  • 4,369 Answers

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

short shadey
  • 421 Answers

SOURCE: Climate Control Air Conditioning

check for vac leaks under hood and dashbord

Posted on Sep 01, 2008

  • 1 Answer

SOURCE: A/C blows cold on floor and windshield, not thru dash vents

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

rteemon
  • 578 Answers

SOURCE: ac only blows thru dfrost and floor vents

check your vent adjuster switch

Posted on Jul 01, 2009

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Sounds like one of your actuators are bad under your dash. Does yours have independent climate controls for passenger and driver? If not check under hood at passenger side and look for a bad vacuum hose near fire wall

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