Mercury 1L2Z-12A648-AA Sender Assembly

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Allow the cooling system to completely cool down. Drain coolant from the radiator to approximately four inches below the upper radiator hose to minimize coolant loss during this procedure. Disconnect the electrical connector from the top of the sending unit. On 4.0L SOHC V6 models through 2000, the upper intake manifold must be removed to access the sending unit. It may be possible to access the sender with the thermostat housing removed. Wrap the threads of the new sending unit with Teflon tape. Remove the old sending unit from the engine. Install the new sending unit and tighten it securely. Connect the sending unit electrical connector. Refill the cooling system. Start the engine and check for leaks.

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.

The temperature sending unit should not be mistaken for the oil pressure sending unit, which is threaded into the cylinder head just above the coolant temperature sending unit.

Power Steering Pressure Switch inspection involves checking fuses and circuits for issues affecting idle quality.

Before replacing the sending unit, allow the cooling system to completely cool down and open the cooling system pressure cap to relieve any pressure in the cooling system. Install the cap to minimize coolant loss.

If the indicator light doesn't go out after the engine starts, the possible reasons could be 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.

This procedure applies to 2008 and earlier V6 models only.

Issues with the ECT sensor can be caused by wiring problems, faulty connections, or a malfunctioning sensor itself.

The upper intake manifold must be removed to access the sending unit.