Question about 2004 GMC Envoy

1 Answer

Rear heat blows cold air

My 2004 Envoy XL rear will not work. The blower works and cold air comes out but no heat with the front or rear controllers. I suspect it is the blower resister. Where is the blower resister located and can this be the cause of the problem?

Posted by on

  • 2 more comments 
  • kryd16 Mar 27, 2009

    Same problem. dealership says i need to add a pump to pump the coolant to the rear. Problem is, it blows warm air in the summer and cold air in the winter. problem isnt getting coolant back there as it was working until recently. doesnt seem like I should add a piece to get it working how it was working without it in the first place.

  • Anonymous Mar 25, 2014

    It's a 2004 there's no heating what so ever what would cause this

  • Anonymous Mar 26, 2014

    the heat blows cold air in the rear vents and no heat is blowing out of the 4 vents above the heads

  • Anonymous Mar 26, 2014

    My blower on my heater only was working on high, but now doesn't work at all. I replaced the resister, but still sounds like the fan is trying to go but can't.

×

1 Answer

  • Level 2:

    An expert who has achieved level 2 by getting 100 points

    Hot-Shot:

    An expert who has answered 20 questions.

    Corporal:

    An expert that hasĀ over 10 points.

    Mayor:

    An expert whose answer gotĀ voted for 2 times.

  • Expert
  • 56 Answers

One of the second heater core lines is clogged.

Posted on Jan 05, 2009

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

Rear blower: only works on high when set on cold, won't work at all when set to heat


I would start with the rear blower motor resistor, the resistor is what controls the speed of the fan, the resistor is located in the rear heater box near the blower, you will need to remove the right rear side panel to access the heater box. start with that

Dec 07, 2012 | 2004 Honda Odyssey

1 Answer

2004 Chevy Suburban a/c and heating issues


see if theres power to the rear blower motor go under the rear and see if the one pipe is cold and the other is hot or at least warm if there the same then the rear system is plugged

Aug 17, 2012 | Cars & Trucks

1 Answer

2004 CHEVY SUBURBAN FRONT A/C WORKS BUT THE REAR DOESN'T TURN ON


There is a blower motor control processor for the back blower - it takes input from the front control and the rear control and decides the fan speed. That processor could be faulty, or the blower motor, or a 30amp fuse in the engine compartment.
In the front system you have a controller and blend doors that direct air thru the heater core and evaporator. You would need to check the operation of those blend doors.

Aug 17, 2012 | 2004 Chevrolet Suburban

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

2003 GMC Envoy rear air conditioner will not blow air and front works fine but nothing works in back of car


You don't state if you have an XL or standard body. The rear blower on both have a fuse to the blower that could be blown.

Jul 10, 2011 | 2003 GMC Envoy

1 Answer

Front heat works, but rear blows cold air only


With your front heat working the most likely cause for the rear heat not to work is that there is an obstruction in the line that is preventing the warm coolant to get to the rear heater core or the rear heater core itself is plugged and not circulating. Another possible cause could be low coolant level where the system has enough coolant to provide the front system with enought warm coolant but not the rear system. Hope this helps

Dec 30, 2009 | 2004 Ford Expedition

1 Answer

Explorer front air not blowing, rear blowing cold air


If the front is still blowing air but not air conditioned air than it is likely that a flap that controls airflow to the front has failed. The rear would still work as it is controlled by an auxiliary control.

If there is no air coming out of the front at all I would suspect a blower motor as the rear has it's own blower.

Either way a scan tool that is able to access the HVAC system is going to be the only to accurately diagnose this problem.

Jul 25, 2009 | 2000 GMC Savana

3 Answers

2004 Ford Expedition XLT, front blend door actuator


Hope I was avle to help, glad you up and going.

May 26, 2009 | 2004 Ford Expedition

Not finding what you are looking for?
2004 GMC Envoy Logo

Related Topics:

1,029 people viewed this question

Ask a Question

Usually answered in minutes!

Top GMC Experts

yadayada
yadayada

Level 3 Expert

61168 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

21949 Answers

Jeff Turcotte
Jeff Turcotte

Level 3 Expert

6812 Answers

Are you a GMC Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...