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Air doesnt come out of defrost or fert vents. Only comes out of front vents

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Its the blend door, any parts store will have them (advanceauto, autozone)

Posted on Mar 20, 2016

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  • Contributor
  • 5 Answers

One of your gate valve is not opening. You might have a vacuum leak on the gate valve

Posted on Dec 03, 2012

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Posted on Jan 02, 2017

  • 98 Answers

SOURCE: air does not come out

This happened to me as well. These vents are controlled by vacuum. The vacuum hose beneath the passenger side cowl is probably disconnected. It is behind the engine just below the passengerside windsheild wiper. I would look for disconnected vacuum hoses. That fixed mine.

Posted on Jul 24, 2008

  • 37 Answers

SOURCE: Heat wont blow through heater or defroster vents

The door in the heater box is most likely stuck. It is located under the dash on the passenger side

Posted on Dec 06, 2008

  • 20 Answers

SOURCE: 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.

Posted on Feb 23, 2009

csmock132
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SOURCE: 2004 GMC Envoy; Very little air flow from FRONT PANEL

Try replacing the cabin air filter.

Posted on Mar 12, 2009

  • 31 Answers

SOURCE: when i turn the air on it doesn't flow from the front vents.

Sounds like the switch or actuator is not operating. Some vehicles have mechanical operators, and some have vacuum actuators. If a vacuum line is loose, it will not actuate.

Posted on Aug 01, 2010

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1 Answer

No cold air coming from front vents?


Vent selections are sometimes powered by vacuum, and fail-safe to the defroster position when the flow is disrupted.

May 06, 2014 | 2007 Pontiac G6 GT Convertible

1 Answer

The front air isn't blowing hard through the vents but some air is blowing through the defrost


The vents are not working properly. most run off of vaccum and that sounds like your problem. could also be the controls. suburbans are famous for this.

Aug 12, 2012 | 1996 Chevrolet Suburban

1 Answer

Air flow issue- intermittently blows from wrong vents


This is a common problem on this site.
In your case I would look for a vac leak or a sticky blend door.
Since the direction of air flow changes when you are accelerating, I'm going to guess the blend door or doors are controlled by engine vacuum. There may be a vac leak between the dash and the engine, or the blend door may not be able to move back and forth correctly.
Defrost is the default position when a problem occurs, to make sure the windshield is clear of fog or frost.

Jul 19, 2012 | 2005 Mazda Tribute

1 Answer

Air blowing out floor and defrost vents but not not front vents


Sounds like a blend door problem. The vacuum from the engine opens and closes the door that directs air flow thru the vents.
I would guess the door is stuck in the middle of the range or something is blocking it.
The blend door(s) is behind the glove box.

Jul 19, 2012 | 2003 Ford Crown Victoria

1 Answer

Front Defrost


clean the pollen filter wherever it is some are under the dash in the ac unit and some are below the grill vents where the wipers are.if this doesnt work then it could be a trampilla playing up thats controling the air in and recirculate .but if tis this then just disconnect the vacumn pipe and stick something in like a stic to hold the flap open .works on a vauxhaul zaffiro and a citreon zx

Nov 18, 2008 | 1996 Honda Civic

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