Where is the Engine coolant sensor located on a 3.1 engine in Pontiac Grand Prix?

The exact location of the engine coolant temperature sensor (ECT) on a 3.1L Pontiac Grand Prix engine can vary slightly depending on the year of manufacture. However, it's generally found on the engine block, near the thermostat housing. It's usually a single-wire or two-wire sensor, and often has a connector easily visible.

To find it definitively:

1. Consult your car's repair manual: This is the most reliable source. The manual will have diagrams and specific instructions.

2. Look at online diagrams: Search for "[Year] Pontiac Grand Prix 3.1L engine diagram" and look for images showing the coolant sensor. Many repair sites have detailed diagrams.

3. Visual inspection: Once you've located the thermostat housing (usually on the top or side of the engine block), carefully examine the surrounding area for a sensor with a single or dual wire connector. The sensor itself is typically a relatively small cylindrical component.

Caution: Be careful when working near hot engine components. Allow the engine to cool completely before attempting any inspection or repair work.