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
I did this procedure:
http://forums.trailvoy.com/showthread.ph...
myself this past week on my 2004 GMC Envoy XL's 4.2L 6 cylinder engine. I removed & replaced the T-Stat, flushed the most of the old coolant and added 2 undiluted gallons of Dex Cool in about 2 hours. Outside of the jacks and lug wrench, all I needed was about 20 inches of extension, a ratchet & 10mm socket, and a universal joint. Every step above was right on, and there were no surprises.
After resetting my "check engine light" (had a P0128 code which is a low coolant temperature fault) the light never came back on. The engine runs rock steady at 210 degrees, where it was before I started getting the "check engine light".
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Follow upper rad hose to the engine, where hose hooks up is the thermostat housing. remove the bolts and thermo is inside.
SOURCE: how do I remove the thermostat from the 2004 GMC
It's actually very simple. Follow the upper radiator hose to the top of the engine block. You will see a housing which the hose is attached to. Remove the hose from the housing. The housing will have 2 or 3 bolts holding it down. Remove the bolts and lift the housing off. The thermostat will be sitting there and you simply need to remove it.
SOURCE: Speedometer on 2004 GMC Envoy not working. It
There is a recall on the panel Cluster... call your dealer and have it checked out.. mention the recall... www.lemonauto.com
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
SOURCE: Where is the cruise control fuse for GMC Envoy
its in the fuse panel under the hood there should be a chart on the cover
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