Ford F2AZ-12A648-A Sender Assembly

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The engine coolant temperature sensor monitors temperature changes and changes its resistance values. To test it, measure resistance values when cold and at operating temperature and check the signal voltage from the PCM.

Unscrew the old sending unit and install the new one as quickly as possible to minimize coolant loss. Tighten the sending unit securely and attach the wire.

The possible reasons for the indicator light not going out after the engine starts include a grounded wire between the light and the sending unit, a defective sending unit, or a faulty ignition switch.

The coolant temperature sending unit is responsible for sending temperature information to the temperature gauge in the dash. It helps indicate the engine's coolant temperature to the driver.

The engine coolant temperature sensor resistance changes in response to engine coolant temperature, decreasing as the surrounding temperature increases. This provides a reference signal to the PCM, indicating engine coolant temperature. The ECT sensor is mounted on the lower intake manifold near the water outlet/thermostat housing, except on 2.3L engines where it is mounted on the water outlet/thermostat housing. To test the sensor, disengage the engine wiring harness connector from the ECT sensor and connect an ohmmeter between the ECT sensor terminals, setting the ohmmeter scale on 200,000 ohms. With the engine cold and the ignition switch in the OFF position, measure and note the ECT sensor resistance. Start the engine and allow it to warm up to normal operating temperature, then turn the engine OFF. Detach the engine wiring harness connector from the ECT sensor again and measure the ECT sensor resistance. Compare the cold and hot ECT sensor resistance measurements with the accompanying chart. If the readings do not approximate those in the chart, replace the ECT sensor. To remove and install the sensor, partially drain the engine cooling system until the coolant level is below the ECT sensor mounting hole. Disconnect the negative battery cable and detach the wiring harness connector from the ECT sensor. Remove the coolant temperature sensor from the intake manifold using an open-end wrench. To install, thread the sensor into the intake manifold by hand, then tighten it securely. Connect the negative battery cable, refill the engine cooling system, start the engine, check for coolant leaks and top off the cooling system.

Remove the coolant temperature sender from the engine block. Attach an ohmmeter, with one lead on the sender's metal body and the other on the wiring harness connector terminal. Submerge the sender in cold water, then slowly heat the water to 188-210°F (88-99°C), observing a steady and even decrease in resistance. Replace the sender if it does not function as described.

After replacing the ECT sensor, start the engine and allow it to reach normal operating temperature. Then, inspect for coolant leaks and check the coolant level in the expansion tank after the engine has warmed up and cooled down.

It may be possible to access the sender with the thermostat housing removed.

With the engine off, disconnect the wire from the temperature sending unit. Switch on the ignition without starting the engine - the gauge pointer should be at the Cold mark. Using a jumper wire, ground the sending unit wire. The needle on the gauge should now be pointing to (or past) the Hot mark. Don't leave the jumper wire connected any longer than necessary.

The two engine coolant temperature senders are generally referred to as the sending unit and the sensor.

The EEC relay and associated circuits provide battery power (VPWR) to fuel injection and electric fuel pump-related components requiring 10.5 volts or greater.

On V6 engines, the sending unit for the gauge is located on the front lower part of the intake manifold, near the thermostat housing.

The coolant temperature indicator system consists of a temperature gauge mounted in the dash and a coolant temperature sending unit mounted on the engine. The sending unit can be located on the intake manifold for V6 models or at the left front of the intake manifold for VB engines. Some vehicles may have multiple sending units, but only one is used for the indicator system while the others send temperature information to the computer. However, on 2005 and later Expedition/Navigator 5.4L engines, a cylinder head temperature sensor is used instead of a coolant temperature sensor. If an overheating indication occurs, it is important to check the coolant level in the system and ensure that the wiring between the gauge and the sending unit is secure and all fuses are intact. To test the temperature sender, it should read in the cold range when the engine is cold. Disconnect the electrical connector from the sender and attach a jumper wire between the two pins of the connector. With the key ON, the gauge should swing to full hot. If it doesn't, there may be a problem in the circuit from the sender to the instrument panel. If the gauge does swing to full hot during testing but not when the connector is in place and the engine is hot, it is recommended to replace the coolant temperature sending unit. When replacing the sending unit, it is important to prepare the new unit by wrapping its threads with Teflon tape or applying sealer. The pressure cap from the degas bottle should be removed to release any remaining pressure in the system before reinstalling it. For 2005 and later Expedition/Navigator 5.4L engines, the intake manifold must be removed to access the CHT. To replace the sending unit, disconnect the electrical connector and unscrew the sensor from the engine. It is advisable to install the replacement unit quickly to minimize coolant loss. After the replacement unit has been installed, it is recommended to check the coolant level.

Camshaft Position (CMP) sensor replacement involves disconnecting the battery, detaching the electrical connector, removing the sensor, and aligning the new one correctly.

The coolant temperature indicator system consists of a light or temperature gauge mounted in the dash and a coolant temperature sending unit mounted on the engine. The coolant temperature sending unit, on 5.0L engines, is located at the front of the intake manifold near the distributor. Some vehicles have more than one sending unit, but only one is used for the indicator system, and the other is used to send engine temperature information to the computer. If an overheating indication occurs, check the coolant level in the system. Ensure the wiring between the light or gauge and the sending unit is secure, and all fuses are intact. When the ignition switch is turned on and the starter motor is turning, the indicator light should glow. If the light is not on, the bulb may be burned out, the ignition switch may be faulty, or the circuit may be open. Test the circuit by grounding the wire to the sending unit while the ignition is on. If the gauge deflects full scale or the light comes on, replace the sending unit. As soon as the engine starts, the light should go out and remain out unless the engine overheats. Failure of the light to go out may be due to a grounded wire between the light and the sending unit, a defective sending unit, or a faulty ignition switch. Also, check the coolant to make sure it's of the proper type and mixture. If the sending unit must be replaced, disconnect the electrical connector and simply unscrew the sensor from the engine and install the replacement.