Question about 2004 GMC Envoy

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Heater will not switch from the defrost to the floor on a 2004 envoy

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Sounds like a vacuum leak from the engine to the heater controls. Can you hear a ssssss noise while the engine is running?

Posted on Dec 08, 2010

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MODE ACTUATOR

Posted on Dec 08, 2010

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1 Answer

2004 GMC Envoy has a banging knocking noise in the dash by defrost every time I start it. blower will not switch from defrost to floor or vents


Sounds like the diverter door is bound up causing the motor to bog down under load. You'll need a manual for that job. It's a pain in the rear to get to.

Jan 30, 2018 | GMC Cars & Trucks

1 Answer

Air will not switch to floor on my 2004 envoy


it is a leak in your vacuum tree that controls the blend door. You can buy spare vacuum line at a parts store pretty cheap. $1 per foot or similar. the trick is finding the bad vacuum line. look for small plastic line coming out of the firewall and replace if cracked

Mar 18, 2014 | Cars & Trucks

3 Answers

Heater clicking noise in gmc envoy


Do you hear a clicking noise when you turn your truck on? Its probably the actuator. While the defroster was on I removed the fuse locted under the rear driver side seat. I think its 36B. It stopped the clicking noise and my air vents work well now.

Dec 08, 2011 | 2003 GMC Envoy

1 Answer

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

1 Answer

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

My 2004 gmc envoy loses engine pressure when i have the air conditioner or the heater on. Also, the air conditioner will not blow out the dash vents but blows out the floor and defrost just fine. Autozone...


Don't know what you mean by engine losing pressure, but as far as the air not coming out of the correct vents, try the following;
Pull the HVAC-B (#36) fuse for 30 seconds (located in rear fuse panel, under seat), then put it back in. Then turn the ignition switch to RUN (no need to start the engine). Don't touch ANY controls for 90 seconds. I don't think it matters what position the controls are in, but some people think it works better if you have the HVAC system turned off. After 90 seconds, the actuators have gone through their paces, the controller has new memory data on the end stops of the rotation of each actuator, and you might be good to go

Jun 06, 2010 | 2004 GMC Envoy

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

Problem with air not coming out of vents.


Check for a vacum leak from the engine to the a/c.The color of the hose is black. Also check if the heater control valve hose is unplugged. If you have vacuum the it sounds like the door for the vent/floor/defrost is broken.

Jun 08, 2009 | 2004 Ford Ranger

2 Answers

2004 Envoy Smell like Anti-freeze when turn on the air


probably is a small seep in the heater core. does not have to be leaking enough to find any inside the car to have a strong smell in there just a small seep that makes the heater core wet will do it.

May 20, 2009 | 2004 GMC Envoy

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