On a inline 6 cylinder, it is right behind the alternator.
Try these links for images.
http://0.tqn.com/w/experts/GMC-Repair-813/2009/11/thermo-1.gif
http://forums.trailvoy.com/attachment.php?attachmentid=2879&stc=1&thumb=1&d=1236050583
http://www.partsgeek.com/assets/rep/thumb/3903-01034619-1064283.jpg
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The thermostat is located inside of the top radiator inlet. The inlet is behind the alternator, and the alternator will have to be removed.
2004 gmc envoy with code p0128
Where is the computer located on a GMC Envoy?
Trouble code P0128 means:Coolant thermostat (coolant temp below thermostat regulating temp)
how to replace wheel bearings on 2004 GMC envoy?
thermostat is located behind the alternator on the drivers side bottom hose 2 bolts and the thermostat and aluminum is one peace cost is around $50.00 at NAPA
where is the map sensor located on a 2005 gmc envoy
Should be a removable housing at the engine end of the upper radiator hose
2004 GMC Envoy is on page 28 http://documents.victorytechnologies.com//documents/product/929.pdf 2004 GMC Envoy is on page 28 http://documents.victorytechnologies.com//documents/product/929.pdf
If the 2004 GMC Envoy came with a tow package, then there should be a trailer brake controller harness. It would be located up under the dash near the brake pedal.
How do you remove the fan shroud on a 2004 get envoy
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