Ford XS2Z-10884-AA Sender Assembly - Temperature

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Allow the cooling system to completely cool down. Drain coolant from the radiator to approximately four inches below the upper radiator hose to minimize coolant loss during this procedure. Disconnect the electrical connector from the top of the sending unit. On 4.0L SOHC V6 models through 2000, the upper intake manifold must be removed to access the sending unit. It may be possible to access the sender with the thermostat housing removed. Wrap the threads of the new sending unit with Teflon tape. Remove the old sending unit from the engine. Install the new sending unit and tighten it securely. Connect the sending unit electrical connector. Refill the cooling system. Start the engine and check for leaks.

When diagnosing the Engine Coolant Temperature (ECT) sensor, thorough testing is crucial before attributing driveability issues to the sensor. Similar to the IAT sensor, the ECT sensor, a thermistor, experiences resistance changes with temperature fluctuations. Positioned in the engine cooling system near the thermostat housing, it monitors coolant temperature, enabling the PCM to calculate the engine operating temperature. Circuit faults in the ECT sensor can trigger trouble codes, and issues may lie in wiring, connections, or the sensor itself. Some engines feature two nearly identical coolant temperature sensor units-one for the instrument panel temperature gauge and the other for the Electronic Engine Control (EEC) system. Disconnecting the ECT sensor and using an ohmmeter reveals resistance values, approximately 40,500 ohms at 65 degrees F and lower resistance at operating temperature. Confirming correct resistance, check for reference voltage, aiming for an open-circuit voltage around 5 volts from the PCM to the sensor connector. When replacing the sensor, wait for engine cooldown, wrap threads with Teflon sealing tape to prevent leakage, disconnect the electrical connector, unscrew the old ECT sensor, install the new sensor promptly, secure it tightly, reconnect the electrical connector, and check coolant levels, adding if necessary. Finally, start the engine, allow it to reach normal operating temperature, and inspect for coolant leaks, checking the expansion tank's coolant level after the engine has warmed up and cooled down.