Question about 2004 GMC Envoy

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

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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

Posted on Mar 15, 2011

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Posted on Jan 02, 2017

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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

My check engine light is on and I can't pass inspection because of this problem. The code that appears is po128. What exactly does that mean?


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1 Answer

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Oct 05, 2009 | 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.

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1 Answer

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like ticking while idling try unplugging eletric fan clutch harness to see if it goes away if it does replace fan clutch and its called a viscuss clutch fan.

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