Driver side engine block behind the alternator.You need to remove the alternator to get to the sensor.
Its in the tank and is one piece with the pump, filter and sensor
The coolant temperature sensor, on a 2005 Chevrolet trailblazer 4.2 liter engine, is located just above the thermostat housing. The thermostat housing is located in the front of the engine.
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location for 2003 chevy trailblazer coolant temperature sensor
where is the temperture sensor located on a 2002 chevy trailblazer with a 4200 motor
7 oclock position behind the crankshaft pulley
behind the altanator under the thermistate
how to change air temperature sensor on astra 2003 how to change air temperature sensor on astra 2003
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seriously? it tells you what temperature you engine coolant/antifreeze is. that is how your gauge on the dash knows what your temperature is at.
If you are reading this then you must read the posts on our forum about the thermostat and replacement. We have all the instructions you need for your trailblazer or other gmt360 platform truck. www.trailvoy.com
need to drop the tank and pull the fuel pump out and change the sensor