Mercury 3L8Z-12A648-A Sender Assembly

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The ECT sensor is fitted on the 4.0L V6 engine only, and it is located at the top of the engine near the upper hose of the radiator. Start with the removal of the cable that is connected in the negative terminal of the battery. Second, it Is necessary to drain the cooling system. Next to do is to remove the electrical connector of the ECT sensor, pull out the retaining clip and pull out the sensor. After that, the installation is done in the reverse order from which the removal was conducted. Last but not the least, replace the fluid of the cooling system.

2.7L V6 models.

Remove the intake manifold, disconnect the electrical connector, unscrew the ECT sensor, and discard it.

To replace the Crankshaft Position (CKP) sensor, disconnect the battery, remove components like the accessory drive belt or alternator, unscrew the sensor, and install a new one with specific alignment procedures for different models.

Wrap the threads of the new sending unit with Teflon tape, remove the old sending unit from the engine, place your finger over the hole in the engine to minimize coolant loss, and immediately install the new sending unit and tighten it securely.

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

If the light doesn't go out, you should check the coolant to make sure it's correctly mixed. Plain water with no antifreeze, or coolant that's mainly water, might have too low a boiling point to activate the sending unit.

To minimize coolant loss during this procedure.

When replacing the ECT sensor, wait for the engine to cool down, wrap the threads with Teflon sealing tape to prevent leakage, disconnect the electrical connector, unscrew the old sensor, promptly install the new sensor, secure it tightly, reconnect the electrical connector, and check coolant levels, adding more if necessary.