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How to replace the thermostat on a 2005 Envoy with a 4.2L engine

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Posted on Jan 02, 2017

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SOURCE: HOW TO REPLACE A THERMOSTAT ON A 2005 GMC ENVOY

Go to www.trailvoy.com and do a search on thermostat replace, there numerous threads that describe the process, some have pictures as well.

Posted on Sep 15, 2011

  • 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

  • 7353 Answers

SOURCE: 2005 GMC Envoy 4.2 L

Yes, Have a repair shop replace it, it comes with a new housing.

Posted on Feb 01, 2011

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How to change thermostat 03 envoy 6 cylinder


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remove upper radiator hose.. if you trace it back to the engine, you will see the thermostat housing.. should be two bolts.. make sure when you reinstall you clean the surface good, and re applicate with gasket sealer, or gasket..

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Www.trailvoy.com


What is "this car"? Are you in the Envoy thread, this its right? Send us year, make, model and engine sizes, please.

Feb 09, 2012 | 2005 GMC Envoy

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Sep 14, 2011 | 2005 GMC Envoy

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I'm wondering whether on my 2003 (B6) S4 4,2l V8 cylinder n. 4 is the fourth one (front to rear) on left bank or the second on the right one. This just to understand the real firing order. Thank...


Firing order for 2003 (B6) Audi S4 4,2l V8 engine is: 1 - 5 - 4 - 8 - 6 - 3 - 7 - 2
Cylinder no.# 1 is first one from right front side of the car, and cylinder no.# 4 is the fourth one (front to rear) on the right bank of cylinder block. See picture below:

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Average cost to repair a thermostat


The new thermostat cost five dollars or less and to install it you start with a cool engine and disconnect the upper radiator hose where it connects to the engine and then remove the piece the hose connected to. The thermostat is behind it take it out and put new one in.

Sep 08, 2010 | 2005 GMC Envoy

1 Answer

Need steps on replacing thermostat on 2002 Envoy


Just replaced my 2005 envoy thermostat, and it might be the same. Here is what I had to do.
1. First, the thermostat was located on the driver side behind the alternator. The hose comes from the bottom of the radiator, not the top like most vehicles I have worked on.
2. You need to remove the belt by taking tension off of it. The tensioner is on the passenger side, under the steering pump. I used a socket wrench, placed in in the square hole on the tensioner, attached a pipe for leverage to the socket, and pulled until the belt was loose.
3. Next is removing the alternator. Best if you first disconnect your battery, as there is a hot line to the alternator. Disconnect the wiring harness located on the top. Remove the bracket bolts that hold the alternator. You might want to place something under the alternator to prevent it from damaging the small wheel under it as it will be heavy and free after you remove the bolts. I also removed the bracket to get full access to the hose and thermostat. There is a red wire that connects to the alternator, remove it and now the alternator can be pulled out and set to the side.
4. Once all this is out of the way, you can remove the hose to the thermostat (I assume you have drained the radiator).
5. Remove the two bolts hold the thermostat to the engine.
6 Replace the thermostat and reverse the order of the steps above.

I read that some can do this without removing the alternator or just loosening, but it is tight and makes the job a lot harder.

Hope this helps...Joe

Mar 06, 2010 | 2002 GMC Envoy

2 Answers

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

Jul 17, 2009 | 2004 GMC Envoy

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

5 Answers

Check engine light on - 2003 gmc envoy XL


That code represents a lower than expected reading for temperature (coolant). First thing to do is check your coolant level, as if it is low, then the sensor can not read correctly. Second, you may have a thermostat that is stuck open, allowing the coolant to cool off too much. The sensor should be mounted on top of the engine, near the thermostat housing.

May 18, 2008 | GMC 2003 Envoy XL

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