Question about 2004 GMC Envoy

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Air con ditioning does not blow air out of dash just defrost and floor

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One of the operating mechanisms or the computer that controls it playing up ,could be dealer only

Posted on Jun 28, 2009

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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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the blend door in the lwr air vents is stuck it should be down by the squerrl cage also it could be electronically controlled

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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.

Jun 28, 2012 | Chrysler Town & Country Cars & Trucks

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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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1 Answer

When I turn my vent selector to defrost on the far right (air con off)the air conditioning comes on. The dash vents will blow ambient air, but defrost setting blows air con. Any ideas?


It's normal for the A/C compressor to come on with the defroster to dehumidify the air so the windsheild won't fog up under humid conditions. You can still control the air temp. out the vents with the temp. select switch.

Jul 19, 2009 | 2005 Jeep Wrangler

1 Answer

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.

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

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