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Where is the coolant temperature sensor on a 1991 ford F150 5.0L?

The coolant temperature sensor on a 1991 Ford F150 5.0L is located on the intake manifold, near the thermostat housing. It is a single-wire sensor with a green connector. To remove the sensor, disconnect the electrical connector and use a wrench to loosen the sensor from the intake manifold. Be careful not to drop the sensor into the intake manifold.