Question about 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:
Posted on Oct 19, 2009
Follow upper rad hose to the engine, where hose hooks up is the thermostat housing. remove the bolts and thermo is inside.
Posted on Jul 18, 2009
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Posted on Jan 02, 2017
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.
Posted on Dec 31, 2009
There is a recall on the panel Cluster... call your dealer and have it checked out.. mention the recall... www.lemonauto.com
Posted on Jun 05, 2009
4.2L Engine the thermostat and the neck where the hose goes on is one unit $25 at autozone
Posted on Dec 29, 2008
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