Question about 2003 GMC Envoy

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Thermostat where about is the therostat located on the gmc envoy. Is it had to get to?

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Its behind and below the alternator follow the top radiator hose down to it.the alternator has to come off.then you will see t-stat housing the t-stat is built in the housing so your part store should have this housing and stat together.there are two 10mm bolts that hold on housing the bottom one is hard to see.most shops will do this job for about$ 200 .

Posted on Jan 29, 2009

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1 Answer

Where is the engine coolant temp sensor on gmc envoy 2004 xuv


More than likely the thermostat is stuck open. You should replace the thermostat and the temp sensor. See picture below for location.

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Apr 04, 2013 | 2003 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?


if you have a code for erratic thermostatic or coolant temp ,change the thermostat it is a known problem ...located under the alternater very hard to change make sure you get an acdelco or dealer part ;) assuming it is the in line engine

Nov 20, 2010 | 2002 GMC Envoy XL

1 Answer

Please tell me where locate the theromostat in


The thermostat is located inside the thermostat housing. To find it follow the upper radiator hose to the engine block.
Depending what size of engine you have the location is different.
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.
If you have a V8 cylinder engine is in front of engine see the picture. Item 303 thermostat housing, 305 thermostat, and 304 thermostat gasket.
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Nov 06, 2010 | 2004 GMC Envoy

1 Answer

Where is the thermostat located on a 2003 gmc envoy?


If you have the 6cyl engine. on the left side of engine, below alternator, its built into the houshing that the hose is attached to. Dont keep what engine your car has a secret. it help us help you.

Sep 02, 2010 | 2003 GMC Envoy

1 Answer

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


If you go to www.trailvoy.com and do a search on thermostat replacement, you will find a thread that details the process.

Aug 04, 2010 | 2004 GMC Envoy

1 Answer

Where is the coolant thermostat located in a 2003 gmc envoy?


The thermostat is behind the alternator and under the pcm on the drivers side of the engine.

Aug 04, 2010 | 2003 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

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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