Question about 2004 GMC Envoy

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

Posted on Sep 09, 2010

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Posted on Jan 02, 2017

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2 Answers

Cylinder 3 location on a 2004 gmc envoy


The coil pack will be numbered. Find coil #3 and follow the spark plug wire to the spark plug.

Jun 15, 2014 | 2003 GMC Envoy

1 Answer

Where it the cylinder 3 location on a 2004 gmc envoy?


count from the front of car to the back. left to right.

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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

IM TRYING TO REPLACE THE THERMOSTAT ON MY 2004 ENVOY WHERE IS IT LOCATAED EXACTLY


The thermostat on this vehicle's In-line 6 cylinder engine is on the driver's side of the engine, below & behind the alternator. You have to remove the alternator to gain access to the thermostat housing. You also need to disconnect the battery before you remove the alternator to avoid sparks and shorts.

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

Mar 15, 2011 | 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?


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

2004 GMC Envoy check engine light remains illuminated. Diagnostics revealed codes: P1133 and P0128. P1133 points to a heated oxygen sensor and P0128 indicates a possible defective thermostat. The O2 sensor...


Leave 02 sensor alone ,it is doing it's job . It is heated up because of lean fuel mixture due to incorrect engine temp.,replace thermostat before looking further.

Jan 20, 2010 | 2004 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

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

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