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.
Just unscrew bolt on thermostat housing ( follow upper radiator hose to engine) remove housing and thermostat, and replace, make sure spring side of thermostat goes inside of engine.
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: 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 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
SOURCE: Removing rear air suspension on GMC Envoy
Just behind right rear tire up in the wheel well. Air inlet is inside right rear quarter near the accessory inflator. Compressor runs 3 lines one for the accessory inflator and one for each air bag.
THere are also 2 sensors, one on each trailing arm that senses load and then raises and lowers accordingly.
SOURCE: what is the best type of motor oil for 2004 GMC
this engine calls for any major brand 5W20W (I prefer Valvoline), in very hot climates u can use 10W30W, but no heavier.
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