Where is the Engine coolant temperature sensor on a 2001 Mercury 4.6 liter?

The Engine Coolant Temperature (ECT) sensor on a 2001 Mercury 4.6L engine (likely a Ford Modular engine, found in many vehicles that year, not just Mercury vehicles) is typically located on the cylinder head, near the thermostat housing. However, its exact location can vary slightly depending on the specific engine configuration.

To find it precisely:

1. Consult a repair manual: A repair manual specific to your 2001 Mercury vehicle model (not just the engine size) will have a diagram showing the exact location of the ECT sensor. This is the best and most reliable method.

2. Visual inspection: Once you have located the thermostat housing (usually on the upper side of the engine), look closely around that area. The ECT sensor is usually a single-wire or two-wire sensor with a connector. It will often be a relatively small sensor, sometimes with a threaded body.

3. Online resources: Search online using your exact vehicle year, make, model, and engine size. Some websites and forums may have pictures or discussions that show the sensor location.

Caution: The engine will be hot if recently run. Allow it to cool completely before attempting to locate the sensor.