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Where is the engine coolant temperature sending unit for gauge Windstar 3.8?

The engine coolant temperature (ECT) sending unit for a 3.8L Ford Windstar's gauge is located on the cylinder head. It's usually a one-wire sensor and is a relatively small unit. Precise location can vary slightly depending on the year, but it's generally near the thermostat housing and will be easily accessible once the engine is cooled down. You'll likely find it towards the rear of the engine, on the passenger side (right side) cylinder head.

Because of its placement, you'll need to consult a repair manual or a diagram specific to your Windstar's year to pinpoint the exact location. A visual inspection with the engine cool is highly recommended.