Ford F5AZ-12A648-AB Sender Assembly

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If an overheating indication occurs, the coolant level should be checked and all connectors in the wiring harness between the sending unit and the indicator light or gauge should be ensured to be tight.

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

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

There are two engine coolant temperature senders. One drives the temperature gauge or warning light on the instrument panel; this is generally referred to as the sending unit. The other is used by the computer to determine engine coolant temperature and adjust fuel/air mixture accordingly; this is generally referred to as a sensor. The two are easily distinguished, since the sending unit for the temperature gauge has only one wire going to it, while the unit that provides information to the computer has two or three wires to it. On SOHC four-cylinder engines, the sending unit for the gauge or light is threaded into the driver's side of the engine block, at the rear, just below the cylinder head. On 2001 and later 2.3L engines the sending unit is located at the rear of the engine mounted into the coolant outlet pipe. Do not mistake the temperature sending unit for the oil pressure sending unit, which is just above the coolant temperature sending unit, threaded into the cylinder head. On V6 engines, the sending unit for the gauge is located on the front lower part of the intake manifold, near the thermostat housing. Allow the cooling system to completely cool down, then open the cooling system pressure cap to relieve any pressure in the cooling system. Install the cap. This will minimize coolant loss during this procedure. Disconnect the electrical connector from the sending unit. 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. Immediately install the new sending unit and tighten it securely. Connect the sending unit electrical connector. Check coolant level and top up if necessary. Start the engine and check for leaks.

For 2005 and later Expedition/Navigator 5.4L engines, the intake manifold must be removed to access the Cylinder Head Temperature (CHT) sensor. The pressure cap from the degas bottle should be removed to release any remaining pressure in the system before reinstalling it.

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.

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.