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The 2003 Trailblazer should have the 4200 I6 Vortec engine. You will find your ECT (engine coolant temp) sensor and coolant thermostat just to the passenger side and front of the engine. There should be a larger radiator hose going to the thermostat housing. If you can see your oil cap...look just to the left (passenger side) and down on the side of the engine. The electrical plug is your ECT sensor and below that...thermostat. It should be a metal looking pipe with a bend of about 90 degree. That whole metal piece is the thermostat as it is built into that piece with the bend in it.

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