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How do i change a thermostat on a 2003 envoy - 2003 GMC Envoy

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The easiest way is to remove the alternater and thru the fenderwell with a long extension

Posted on Mar 13, 2011


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How to change a thermostat on a 2003 trailblazer

need to jack up and remove drivers side tire and using long extensions unbolt the thermostat housing from the lower side of engine or remove a few thing [alternator belt etc] and go through top its tight but the following link has video of both ways of doing replacement
How to replace thermostat 4 2 envoy or trailblazer

Jun 05, 2017 | Cars & Trucks

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How to change thermostat 03 envoy 6 cylinder

hey my friend the thermostat in not like others its a real pain here is exactly what you have to do if u have the 4200 vortec How to replace thermostat 4 2 envoy or trailblazer
btw in case u was wondering or did not know the trailblazer and envoy is the same

May 26, 2015 | 2003 GMC Envoy

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.


Apr 04, 2013 | 2003 GMC Envoy

1 Answer

4.2 water pump replacement

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

Just replaced thermostat and temp gauge is reading 200. is that normal or ok. 2003 envoy

that's very normal, beacuse 2003 envoy and trail blazer use a 192 degrees thermostat.

Jul 05, 2011 | 2003 GMC Envoy

1 Answer

Where is the thermostat for a 1998 envoy 4.6 liter engine

Hello! Remove air cleaner outlet duct...Remove throttle body bracket nuts and reposition bracket...Thermostat housing is now visible...See pictures below...Guru...saailer



Nov 24, 2010 | 2003 GMC Envoy

1 Answer

How do you change the sensor for the check engine light that produces the Code 0128?

You'll find that this is actually your thermostat, not the actual sensor itself. Your thermostat is sticking open causing it to run too cool. Replace the thermostat, and that light will go out. I went a year with this problem, replaced the sensor twice, light would still go on. The bad thermostat was causing bad readings by the sensor. Very common problem for Envoys and Trailblazers.

Oct 26, 2010 | 2003 GMC Envoy Xl

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

1 Answer


may have a bad throttle body check for codes if you have a p01516 must of the time it is a throttle body problem

Jan 19, 2010 | 2003 GMC Envoy

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