Ford 3C3Z-10884-AA Sender Assembly - Temperature

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The engine coolant temperature sensor is mounted near the thermostat housing and is a thermistor, a resistor which varies the value of its resistance in accordance with temperature changes. This change in resistance values directly affects the voltage signal from the sensor to the PCM, with resistance values increasing as sensor temperature decreases and decreasing as sensor temperature increases. Any problem in the ECT sensor circuits will set a diagnostic trouble code. To replace the sensor, ensure the ignition key is in the OFF position and drain approximately one gallon from the cooling system. On 6.0L models, disconnect the wiring connector for the cooling fan, disconnect the electrical connector and carefully unscrew the sensor. On 6.4L engines, remove the air cleaner housing to access the sensor, which is located near the base of the oil filter housing. Wrap the threads of the new sensor with Teflon sealing tape to prevent leakage and thread corrosion. On 6.4L engines, the sensor is sealed with an O-ring, so do not use tape, just install a new O-ring. Installation is the reverse of removal. Note that on later 7.3L and 6.4L models, the ECT sensor is located in the engine front cover.

First of all, the coolant temperature indicator system consists of a gauge on the dashboard and a sending unit on the engine. Gasoline engines have a temperature-sending unit on the intake manifold and a separate CHT sensor for the PCM. Also, diesel engines use an ECT sensor for both the PCM and gauge. To troubleshoot overheating, check the coolant level, wiring connections, and fuses. Test the circuit by disconnecting the sender and connecting a jumper wire. If the gauge doesn't read full HOT, there's an issue in the circuit. For diesel engines, have the ECT sensor checked by a dealer. To replace the sending unit, prepare the new unit, release system pressure, disconnect the connector, unscrew the old unit, and install carefully as to not lose coolant.