Should be a removable housing at the engine end of the upper radiator hose
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In a 2004 GMC Envoy both the 4.2 liter six cylinder and the 5.3 liter V8 engines use a timing CHAIN
I have a 2003 Envoy. I get better gas mileage by using mobile 1 0w-40 oil. Use any oil approved to be a substitute for BMW longlife. I drive 32miles a day, 24 miles highway and 6 city. In bumper-to-bumper about 1/2 the time. I get 17mpg. When I drive straight highway I get 22.7-23mpg. I never get less than 20mpg on the highway.
feb 28 2008. had a gmc envoy xuv since march of 2004.with the maintence done when due,the SUV is solid.had service engin soon lite come on,this was gas cap related.IT MUST BE ON IF THE ENGIN IS ON OR IF THE IGNITIOIN IS ENGAGED. expect to ware out a set of tires in two years or 30,000 miles.
You will need to allow the seat belt to retract completely, and if this does not work there is a problem with the actuater and you will need to take it in for service.
Coolant temp sensors are usually located very close to the thermostat housing, so follow the upper radiator hose to the engine, it will attach to the thermostst housing and you will see the coolant sensor close by.