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AC DOES NOT BLOW THRU DASH VENTS, ONLY THRU VENTS UNDER DASH 1989 CADILLAC BROUGHAM.

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Check your vacuum lines running from the motor to
the firewall , many vehicles use engine vacuum to
operate these vents , a broken or cracked line
will prevent proper operation.

Posted on Sep 09, 2010

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Posted on Jan 02, 2017

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1 Answer

How do i fix my ac so it will blow throuhg the vents


Most common reason is a faulty blend door under the dash.
The blend doors direct air thru the vents and also control temp.
You may need a shop manual to diagnose the actual problem and repair it.

Aug 06, 2015 | 2001 Mercury Sable

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Cadillac Seville 2007 hot or cold air won't blow thru vents blows fine in the back can hear under dash some clicking wen changing from the floor back to dash vents but nothing happening


HAVC Vent Blend Door failure, under the dash

There are several

Have to check for codes or do whatever is needed to
locate the failed ones & replace

Aug 04, 2014 | Cadillac Seville Cars & Trucks

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Left Vents blow warm/hot air when calling for cold air


Usually a sign of a faulty blend door under the dash.
The blend doors direct air thru the ac and heater core along with the upper and lower vents.

Sep 12, 2012 | 2009 Chevrolet Silverado 1500

1 Answer

1999 durango vent control switch will not let AC blow threw vents only defrost


Usually this is a problem with the blend doors under the dash. You either have a vac leak, a dead motor, or a faulty door.
The control opens and closes the doors to direct air thru the heater core and evaporator core along with directing air thru the vents.
When a problem occurs, the default position is the defrost vents to make sure the windshield remains clear.
You can do an internet search for "repair durango blend door" for more info.

Jul 29, 2012 | 1999 Dodge Durango

2 Answers

Ac only blows from floor vent,does not blow through dash vent


You may need to pull the battery cable to clear the memory codes.
Otherwise, the controller could have failed or something with a blend door. When the controller "sees" cool air it commands the blend door to change air vents.

Jul 13, 2012 | 1991 Cadillac Brougham

1 Answer

AC works fine at first then stops blowing thru dash vents and will only blow thru defrost and floor vents. this is an 02 chevy trailblazer. It this an expensive thing to fix?


It's most likely a vacuum line, look under your hood (close to the cowl panel) for a disconnected, cracked or broken vacuum line.

In some rear cases, it could be the vacuum switch (in dash). Or vacuum diaphragm (under dash).

Hope this helps you ???

Jun 21, 2011 | 2002 Chevrolet TrailBlazer

1 Answer

1989 Cadillac heat flow system is not flowing properly. Ive got heat low, med, and high the motor is kicking on but its not blowing out at the right strength. What would be the issue? Is there a cabin...


Check to see if the air is coming out of the defrost vents up on top of your dash...by the windshield. If this is the case...you have a vacuum line that has either come loose under the dash....or....the vacuum controller located behind the AC/Heat controller is not functioning properly. ( Tip....Vacuum is what actuates the "doors" inside your AC/Heat plenum...directing airflow straight out front vents...up to the defrost....and down to the heat.....

Theroadisalover

Try to post back and let me know If I helped you solve your problem. It will help me with my rating....! Thanks

Jan 01, 2011 | 1989 Cadillac Sedan DeVille

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Why is my ac not blowing hard thru the vents?


check vacuum lines under hood for leaks

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