Ford F68Z-10884-AA Sender Assembly - Temperature

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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.

The coolant temperature indicator system includes a warning light or temperature gauge on the dash and a coolant temperature sending unit on the engine. Four-cylinder models and 2009 and later V6 models use a Cylinder Head Temperature (CHT) sensor, while 2008 and earlier V6 models use an Engine Coolant Temperature (ECT) sensor. These sensors serve as information sensors for the Powertrain Control Module (PCM) and also function as the coolant temperature sending unit. If an overheating indication occurs, check the coolant level and ensure all connectors in the wiring harness between the sending unit and the indicator light or gauge are tight. When the ignition switch is turned to START and the starter motor is turning, the indicator light (if equipped) should come on, indicating a functioning bulb. If the light does not come on, it may be due to a burned-out bulb, faulty ignition switch, or open circuit. Once the engine starts, the indicator light should go out and remain off unless the engine overheats. If the light does not go out, it could be due to a grounded wire between the sending unit and the light, a defective sending unit, or a faulty ignition switch. It is important to check the coolant to ensure it is correctly mixed, as plain water or coolant with a high water content may have too low a boiling point to activate the sending unit.

The MAF sensor measures air entering the engine. You should check for power, signal voltage (0.2 to 1.5 volts at idle, increasing to about 2.0 volts at 60 mph), and use an ohmmeter for resistance checks.

Some possible reasons for the indicator light not being on when the ignition switch is turned on and the starter motor is turning include a burned-out bulb, faulty ignition switch, or open circuit.

The coolant temperature indicator system includes a warning light or temperature gauge on the dash and a coolant temperature sending unit on the engine.

The coolant should be checked to ensure it is of the proper type and mixture.