Where is the engine coolant temperature sensor on a 2004 Chevrolet Impala?

The engine coolant temperature (ECT) sensor on a 2004 Chevrolet Impala is typically located on the engine block, near the thermostat housing. However, the exact location can vary slightly depending on the engine (3.4L, 3.8L, or 5.3L).

To be certain, you should:

* Consult your vehicle's repair manual: This is the most reliable source. It will have a diagram showing the exact location.

* Use a reliable online parts diagram: Many websites like AutoZone, Advance Auto Parts, or Napa Auto Parts allow you to select your year, make, and model, and then view a diagram of your engine. Look for the "ECT sensor" or "coolant temperature sensor."

Without looking at your specific engine, I can't pinpoint the exact spot. Be aware that accessing it might require removing some components for better visibility.