Question about 2004 GMC Envoy

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Replace thermostat on 2004 gmc envoy - 2004 GMC Envoy

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The thermostat on this vehicle's (the Envoy & Trailblazer are essentially the same vehicle) In-line 6 cylinder engine is on the driver's side of the engine, below & behind the alternator. It is not found in the typical location (which may be for the 8 cylinder engine), in an answer above.

Most directions outline removal of the alternator to gain easy access to the hose clamps, bolts and housing of the thermostat. I have located a site that after free registration, has detailed instructions on how to do this job, and the link below that describes an easier method with photos. Check out:

http://forums.trailvoy.com/showthread.php?t=54225&highlight=replace+thermostat

Posted on Oct 19, 2009

  • Steve Oct 24, 2009

    I did this procedure:

    http://forums.trailvoy.com/showthread.ph...

    myself this past week on my 2004 GMC Envoy XL's 4.2L 6 cylinder engine. I removed & replaced the T-Stat, flushed the most of the old coolant and added 2 undiluted gallons of Dex Cool in about 2 hours. Outside of the jacks and lug wrench, all I needed was about 20 inches of extension, a ratchet & 10mm socket, and a universal joint. Every step above was right on, and there were no surprises.

    After resetting my "check engine light" (had a P0128 code which is a low coolant temperature fault) the light never came back on. The engine runs rock steady at 210 degrees, where it was before I started getting the "check engine light".


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Follow upper rad hose to the engine, where hose hooks up is the thermostat housing. remove the bolts and thermo is inside.

Posted on Jul 18, 2009

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bschilz
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SOURCE: how do I remove the thermostat from the 2004 GMC

It's actually very simple. Follow the upper radiator hose to the top of the engine block. You will see a housing which the hose is attached to. Remove the hose from the housing. The housing will have 2 or 3 bolts holding it down. Remove the bolts and lift the housing off. The thermostat will be sitting there and you simply need to remove it.

Posted on Dec 31, 2009

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There is a recall on the panel Cluster... call your dealer and have it checked out.. mention the recall... www.lemonauto.com

Posted on Jun 05, 2009

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SOURCE: Replace the thermostat on 2002 GMC Envoy

4.2L Engine the thermostat and the neck where the hose goes on is one unit $25 at autozone

  1. Remove the necessary coolant from the radiator.
  2. Remove the alternator, Loosen the outlet hose clamp at the thermostat housing. Remove the outlet hose from the thermostat housing.
  3. Remove the thermostat housing bolts.
  4. Remove the thermostat housing from the engine block.
  5. Clean all of the surfaces of the thermostat housing.
  6. Clean the sealing surface of the engine block.

Posted on Dec 29, 2008

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Posted on Feb 24, 2010

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SOURCE: how do I replace the Thermostat. GMC Envoy

remove the upper hose then the two bolts
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Posted on Mar 28, 2010

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Please see my tip at http://www.fixya.com/cars/r5929960-s_thermostat . These are generic instructions. If you get stuck or need specific instructions for your car, please get back to me with model, year and engine info.

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2 Answers

How do I remove the thermostat from the 2004 GMC Envoy????


It's actually very simple. Follow the upper radiator hose to the top of the engine block. You will see a housing which the hose is attached to. Remove the hose from the housing. The housing will have 2 or 3 bolts holding it down. Remove the bolts and lift the housing off. The thermostat will be sitting there and you simply need to remove it.

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Replace my thermostat


well do you have the 4.2 or 5.3 motor 6cy or 8cy need to know and i can help

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2004 gmc envoy code 0128


This an engine coolant temperature fault, most likely caused by a defective thermostat, probably one that is open all the time.

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