Ford E1AZ-12A648-A Sender Assembly

First of all, a light or gauge on the dash, and a sending unit on the engine are used in the coolant temperature indicator system. In case of overheating, check the coolant level, wiring, and fuses. Grounding wire to the sending unit helps to test the circuit. In case of any need, replace the sending unit. Also, check the coolant type and mixture. The electrical connector should be disconnected to enable you to remove the sensor from the engine so that you can replace it with a new one.

The coolant temperature indicator system has a dashboard light and engine-mounted sending unit. If overheating is indicated, check the coolant level, wiring, and fuses. The indicator light should glow when the ignition is on and the starter motor is running. If it doesn't, the bulb may be burned out, the ignition switch faulty, or the circuit open. Grounding the wire to the sending unit can help diagnose the problem. If the light doesn't go out after the engine starts, it could be due to a grounded wire, defective sending unit, or faulty ignition switch. Check the coolant type and mixture. If replacing the sending unit, disconnect the connector, unscrew the sensor, and use sealant on the threads. Ensure the engine is cool before removal and be ready for coolant loss. Check the coolant level after replacement.

First of all, a light or gauge on the dash, and a sending unit on the engine are used in the coolant temperature indicator system. In case of overheating, check the coolant level, wiring, and fuses. Grounding wire to the sending unit helps to test the circuit. In case of any need, replace the sending unit. Also, check the coolant type and mixture. The electrical connector should be disconnected to enable you to remove the sensor from the engine so that you can replace it with a new one.

It's recommended to wear a static discharging wrist strap and avoid working on electronics when relative humidity is under 25 percent to prevent static electricity-related damage.

Before removing the old sending unit, remove the radiator cap to relieve any residual pressure, then reinstall the cap.

During replacement, it's essential to wait for the engine to cool, use Teflon tape on threads, and handle the sensor with care.

If an excessively high temperature indication is observed, consider troubleshooting procedures.

The MLP sensor, now called the Transmission Range (TR) sensor, indicates transmission gear.

If the coolant temperature gauge doesn't register after the engine warms up, turn off the engine and disconnect the wire at the sending unit. Use a jumper wire to connect it to a clean engine ground. If the gauge now displays "Hot", replace the sending unit. If the gauge still does not register, check the wiring and connections for any damage or corrosion. Inspect the gauge itself for functionality by testing it with a multimeter. If all components are functioning correctly, the issue may lie within the vehicle's instrument cluster, which may require professional diagnosis or replacement. Always refer to the vehicle's service manual for specific troubleshooting steps and specifications related to your Ford model.