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A/c blows through defrost only - 2004 Mercury Grand Marquis

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Doors on ac willnot switch

Posted on Aug 15, 2010

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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 ?

Jun 17, 2015 | 2010 Chevrolet Equinox

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1998 Honda accord. heater blows good on floor and dash, but defroster does not defrost wind shield


You have to locate the vacuum motor for the defrost. It is bad or the vacuum line has come off or is broken.

Mar 06, 2015 | 1998 Honda Accord

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Defrost isn't blowing air


ur r going to have to check the button or the release lever that alouds u to move the air to the other positions sometimes that's the problem

Nov 29, 2013 | 1996 Volvo 850

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2002 gmc safari van defrost blow cold, a/c blow out of defrost


open the hood and check for leak on any plastic vacuum lines.

Oct 19, 2012 | 2002 GMC Safari

1 Answer

Defrost blows constantly? How do i fix it?


does it blow through the defrost vent only when you switch to vent/floor or does it blow through defrost and vent/floor? is it a switch that is just electric or a manual lever that you slide? the manual type will have that problem if the diverter or the linkage behind the lever(in the dash behind the panel......may be able to access underneath) becomes broken or disconnected so that the air is diverted to defrost regardless where you move it.if you can get to it, you will see what is broken or maybe a fastenerr fell off.

Feb 13, 2010 | 1994 Chevrolet C1500

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Air conditioning blows through defrost vents only


AC blows where you have your control switch set,if it only comes out your defroster have the vacuum check at the blend air doors or if you have a faulty heater control unit.

Jul 13, 2009 | 2004 Ford F150

1 Answer

1996 ford mustang convertible ac blows cold only from defroster


Does it still blow out the floor and defrost when you set the switch to those positions or does it alway blow out the defrost no matter what? If you can get air to blow out to the floor, then it sounds like you lost the switch that controls the airflow to the vents. If it only blows out the defrost, then you probably lost the vacuum to all of the switches. When the vacuum is lost, it will only blow out the defrost. Check the smallest line on the vacuum distribution block located in the corner near the brake master cyclinder. That line provides the vacuum to control the direction of airflow within the cabin.

Jun 08, 2009 | 1996 Ford Mustang

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When i have the heater/defroster on the heater below blows cold air while the defrost blows hot. when i switch to just defrost the bottom heater stays on and blows cold air. when i have front dash and...


It sounds like you have a blend air door stuck. This is in the housing of the heater a/c blower unit under the passenger side of the dash. There is a motor on the top of the housing that could possibly be stuck or on working.

May 10, 2009 | 2003 Dodge Durango

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

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