Lincoln F65Z-10884-AA Temperature Sender Assembly

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.

The coolant temperature indicator system includes a dashboard gauge and a sending unit on the engine. The unit's location varies depending on the engine model. Some vehicles have multiple units, but only one is used for the indicator system. On 2005 and later Expedition/Navigator 5.4L engines, a cylinder head temperature sensor is used. If overheating is indicated, check the coolant level, wiring, and fuses. To test the sender, disconnect the connector and attach a jumper wire. If the gauge doesn't swing to full hot, there may be a circuit issue. If the gauge works during testing but not when hot, replace the unit. Prepare the new unit with Teflon tape or sealer. For 2005 and later models, the intake manifold must be removed to access the CHT. Disconnect the connector and unscrew the sensor to replace it. Install quickly to minimize coolant loss and check the coolant level after installation.