Question about 2004 GMC Envoy

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Replace my thermostat

How do I change My thermostat on my GMC Envoy

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  • yadayada
    yadayada May 11, 2010

    what engine do u have?

  • kim nicol Jan 11, 2013

    4.2l

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  • Master
  • 355 Answers

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

Posted on Oct 05, 2009

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Posted on Jan 02, 2017

  • 91 Answers

SOURCE: 2004 GMC Envoy has trouble idling

Try the fuel filter. Sounds like the engine might be running rough due to weak fuel pressure. Its cheaper to replace, especially if it's still original from 04. Try running some injector cleaner through a couple of tanks of high octane gas.

Posted on Aug 06, 2008

  • 341 Answers

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

  • 250 Answers

SOURCE: battery removal on a 2004 GMC Envoy

The battery is on the right side behind the fuse box. You need a metric set to undo the 3 screws. Theres one that attaches to the body, one to the bar that goes along the top, and theres one on the left side below the vacuum hose and air induction. After you've taken out those three, you should lift the whole thing out(battery and shroud) together. It's hard to take the shroud off before you lift the battery out. After that, you have to pry the shoud off the battery. The two terminals in the back make it hard. Then just go to any auto parts store and they'll give you a new one. 

Posted on Jan 28, 2009

  • 7353 Answers

SOURCE: 2003 gmc 4.2l envoy coolant temp below thermosat rating..

maybe the same problem, if its not getting to 195f its not enough.

Posted on Oct 01, 2009

  • 3287 Answers

SOURCE: replace thermostat on 2004 gmc envoy

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

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This should be a 1 to 1-1/2 hour job. Also, have the mechanic change the thermostat and temperature sensor while he is at it, if they have not ever been changed.

Aug 25, 2012 | 2003 GMC Envoy

1 Answer

How to change thermostat


It pretty much boils down to removing the thermostat housing and removing the theremostat and reversing this procedure to install. How you must actually go about this can vary depending on which engine your Envoy is equipped with. On some of the newer engines, the entire thermostat housing must be replaced.

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1 Answer

Where is thermostat on 2004 gmc envoy 4.2L V6


at the front of the engine, right behind the alternator, you have to remove the alternator to change the thermostat.

Dec 11, 2010 | 2004 GMC Envoy

1 Answer

Where is the location of the coolant temperature sensor on my 2004 gmc envoy,and what is the best way to get at it?


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Nov 20, 2010 | 2002 GMC Envoy XL

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How do I replace a thermostat in a 2004, 6 cylinder, GMC Envoy? Where is the thermostat located?


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Aug 04, 2010 | 2004 GMC Envoy

1 Answer

I need to change my thermostat on my 2003 gmc envoy and do not know where it is located


its behind the alternator ,thermostat and housing is 1 unit,cant be purchased separately.

May 15, 2010 | 2003 GMC Envoy Xl

2 Answers

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.

Jul 17, 2009 | 2002 GMC Envoy XL

1 Answer

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.

Dec 29, 2008 | 2002 GMC Envoy

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