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I ' be change the thermostat and it's still blow out cool air on my 2004 Envoy and the selector want chane to vents or the floor it say in the defrost

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Probably a vacuum leak in the system somehwere

Posted on May 09, 2017

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1 Answer

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,

Jun 13, 2012 | 2007 Ford Sport Trac Limited

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On my 2004 Gmc Envoy, Heat only comes out on passenger side, still blows cold air on drivers side. Defrost, floor and vents all produce air flow. Rear heater works fine. A/C works fine. Any idea?


Sounds like the driver's side temperature actuator or blend door are defective. Part of the dash needs to be removed to access these parts.

Oct 26, 2011 | 2004 GMC Envoy

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I have a 2004 gmc envoy and we recently changed batt , and now the a/c want blow thur the front vents but blows thru the floor and defroster fineand we put a new acuator on and now it want blow thru the...


Try recalibrating the HVAC system first. Set all HVAC controls and switches to their OFF or CCW positions, then disconnect battery for a couple of minutes, reconnect battery and don't touch any of the HVAC controls for 2 - 3 minutes. If this does not correct the problem, you may have a stuck blend door or another bad actuator.

Jul 26, 2011 | 2004 GMC Envoy

1 Answer

I have a 2004 gmc envoy and it is blowing out nothing but cold air unless you put it to where it is blowing on you then only 2 vents will blow out hot air, changed the blower motor, thermostat, I even...


It sounds as if one or more of the door actuators is not moving the blend doors. Unfortunately, it will require some disassembly of the dash.

Oct 21, 2010 | 2004 GMC Envoy

1 Answer

Ac and heat will not blow threw vents just floor and defrost


Sounds like your selector switch is messed up to select where you want the flow of air to go. When you turn the switch to where you want the air to go does it work on floor and when you turn the switch to vent it doesn't?

Jul 11, 2009 | 2004 Chevrolet TrailBlazer

1 Answer

2003 envoy ac blows cold from defrost and floor but will not dash


u have to take your dashboard at the glove compartment to cheack the vacuumpod ot your damper door

Jun 27, 2009 | 2003 GMC Envoy

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

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