Question about Hummer H2

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My air will not blow out of the vents , It will only blow through the dash or the defroster . What can the problem be?

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Vac actuator at heater box is either bad or vac line came off or is cracked

Posted on Jan 03, 2011

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1 Answer

AC is only blowing through the defrost vents in the dashboard?


I think your problem is the head unit that selects where the air comes out ie. Face, floor, defrost, or hi-level face and floor. If that's not working then it will not let you switch location that you want the air to come out.

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2007 chrysler town and country a/c blows cold through floor and defrost vent but not dash vents


Often a sign of a blend door problem. The blend door or doors are in the heater a/c box behind the dash.

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Ac vents not working


There is a blend door acuator which moves when u change your settings. Its a electric motor. Down under dash, Will need a mech and a heating and cooling diagram to find where the motor is,

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Why does the air only blow out of the defrost not dash vents?


Colin - you must be a mechanic that hates people that perform home repairs because you lose $$$?

Apr 27, 2012 | 2005 Mercury Mountaineer

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Blowes air throught defrost vents only


its a problem with the switching mechanism. you have to look up under the dash to see if you can see where the switching mechanism is. if you can not see it from there youll have to remove complete center dash

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


Is it a new vehicle? I had a new vehicle that had the same problem. Answer was that the holes weren't punched out of the vent.

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sounds like you have a vacuum problem

Apr 14, 2009 | 1998 Chevrolet S-10 Pickup

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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.

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Had the same problem. believe it or not i changed the gas cap and got heat all around. something about pressure.

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