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The thermostat on this vehicle's In-line 6
cylinder engine is on the driver's side of the engine, below &
behind the alternator. You have to remove the alternator to gain access to the thermostat housing. You also need to disconnect the battery before you remove the alternator to avoid sparks and shorts.
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:
The thermostat is located inside the thermostat housing. To find it follow the upper radiator hose to the engine block. Depending what size of engine you have the location is different. 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. If you have a V8 cylinder engine is in front of engine see the picture. Item 303 thermostat housing, 305 thermostat, and 304 thermostat gasket.
Leave 02 sensor alone ,it is doing it's job . It is heated up because of lean fuel mixture due to incorrect engine temp.,replace thermostat before looking further.
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:
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