Question about 1998 Pontiac Bonneville

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Air blows out of defrost but not the vents - 1998 Pontiac Bonneville

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Air cond does not come out of dash vents automatic climate control

Posted on Aug 09, 2010

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By the brake booster under the hood is a vaccum hose that attaches to a a plastic plug that may bed disconnected or broken which needs to be replaced or repaired. you can repair it by splicing it together with a small vaccum hose.

Posted on Jul 05, 2010

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Posted on Jan 02, 2017

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SOURCE: 2004 Pontiac Montana blows cold air in defrost

There is a mix damper inside your duct that controls the heat over heater core and ac evaporator that to your floor and one to your defrost. it is probable an electric actuator, that is not functioning properly. If yu can locate it and manually move it, you might have to remove the actuator motor first, you should be able to figure out your problem, I hope this helps! merry Christmas!

Posted on Dec 22, 2008

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SOURCE: Air comes out of the defroster and floor vents but not the air co

under the hood on the firewall there is a square boxlike cover beside the maxifuse&relay. there is a vacucum hose there that controls the vent shutoff had same problem with my 93 bonneville sse when purchased, check to see it has no cracks or has pulled out of rubber connecter .

Posted on Mar 28, 2009

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I have a 2010 Equinox that only blows air out of the defrost vents. Does anyone know what could be wrong?


Isn't air supposed to blow out of the defrost vents ? Otherwise, how is it supposed to defrost a window if it isn't turned on defrost. Does it blow air out when not on defrost ?

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Air Con on my 2009 Mercury grand marquis is giving me problems. Cold air blows out the defrost vents but will not blow out the main vents. Please advise


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Jul 14, 2012 | Cars & Trucks

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Ac vents not working


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Jun 13, 2012 | 2007 Ford Sport Trac Limited

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Dash vents will not blow air. Defroster and floor vents blow fine.


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May 23, 2009 | 2004 GMC Envoy

1 Answer

Heat wont blow through heater or defroster vents


common problem, check under dash by the gas pedal if control arms are muving went selecting from ac to heat cuz this it is the control for the vents to go from ac to heat and to defrost.

Jan 18, 2009 | 1997 Chevrolet K1500

2 Answers

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vents are blocked so air is diverted to other vents, check and clean if necessary

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