Question about 2005 GMC Envoy

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Have 05 envoy the rear heat is not working just blows cold air

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  • 1,142 Answers

Check to see that coolant hose going to the heater is hot. If not, may need to change the valve at the firewall to fix this common problem.

Posted on Jan 01, 2011

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Posted on Jan 02, 2017

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SOURCE: My 05 Escalade rear air heat is not working- blowing cold air onl

Try blowing ou tthe heat exchanger with compressed air. Make sure it's cool b4 removing hoses..

Posted on Jan 19, 2009

fphandyworks
  • 56 Answers

SOURCE: Rear heat blows cold air

one of the second heater core lines is clogged.

Posted on Jan 05, 2009

  • 85 Answers

SOURCE: 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

Posted on Dec 30, 2009

  • 1608 Answers

SOURCE: m rear heat in my03 envoy blows cold air

There is a service bulletin for poor rear heat on these models.The bulletin number is 05-01-37-002A.The part numbers are 89024885 for 4.2 engine and 89024886 for the v8 engine.It is an auxiliary pump the helps the coolant flow to the rear.The a/c system has to be recovered so I don`t think you can do this at home unless you have an a/c recovery machine.Hope this helps.Good luck.

Posted on Feb 22, 2010

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Jan 21, 2016 | Cars & Trucks

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

2 Answers

I have a 2002 GMC Envoy XL that blows cold air from the rear heat vents. What could the cause be?


the heat accuator could be bad. It is a motorized part that adjusts your temprature by allowing cold or warm air flow when you adjust the temprature at the knob you are turning

Jan 21, 2011 | 2002 GMC Envoy

1 Answer

M rear heat in my03 envoy blows cold air


There is a service bulletin for poor rear heat on these models.The bulletin number is 05-01-37-002A.The part numbers are 89024885 for 4.2 engine and 89024886 for the v8 engine.It is an auxiliary pump the helps the coolant flow to the rear.The a/c system has to be recovered so I don`t think you can do this at home unless you have an a/c recovery machine.Hope this helps.Good luck.

Feb 22, 2010 | GMC Envoy Cars & Trucks

2 Answers

Removing rear air suspension on GMC Envoy


Just behind right rear tire up in the wheel well. Air inlet is inside right rear quarter near the accessory inflator. Compressor runs 3 lines one for the accessory inflator and one for each air bag.
THere are also 2 sensors, one on each trailing arm that senses load and then raises and lowers accordingly.

Dec 28, 2009 | 2002 GMC Envoy XL

1 Answer

2006 Envoy SLT air suddenly stopped blowing from vents


the resister block needs changing... oddly enough i'm unsure of what fan you are saying is not working.... if it's the front.. the resister block is located on the duct work under the dash for the air... near the fan... you will see a connector going into the side of the duct work. two screws and the block comes out... should be fairly obvious for the rear one but it will be near the fan.

Apr 16, 2009 | 2006 GMC Envoy

1 Answer

Rear heat blows cold air


one of the second heater core lines is clogged.

Jan 05, 2009 | 2004 GMC Envoy

1 Answer

My 05 Escalade rear air heat is not working- blowing cold air onl


Try blowing ou tthe heat exchanger with compressed air. Make sure it's cool b4 removing hoses..

Dec 02, 2008 | 2004 Cadillac Escalade

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