Jeep 5149096AB COOLANT Temperature

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Partially drain cooling system below cylinder heads. For V6, disconnect ECT sensor from lower intake manifold, wrap threads with Teflon tape, then refill. For V8, remove accessory drivebelt, unbolt A/C compressor, disconnect ECT sensor from engine block, wrap threads with Teflon tape, then refill.

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 ECT sensor functions as the sending unit and provides information to the PCM. If an overheating indication occurs, check the coolant level and wiring harness. When the ignition switch is turned to START, the indicator light should come on.

The engine coolant temperature sensor is a thermistor mounted into an engine water jacket. The change in resistance values directly affects the voltage signal from the sensor to the PCM. As the sensor temperature increases, resistance values decrease, and as the sensor temperature decreases, resistance values increase. On 2.4L four-cylinder engines, the sensor is located on the left side of the front of the cylinder head. On 3.7L V6 engines, the sensor is located on the front of the intake manifold, behind the alternator. To replace the sensor, partially drain the cooling system, disconnect the electrical connector, and unscrew the sensor. Before installing the new sensor, wrap the threads with Teflon sealing tape to prevent leakage and thread corrosion. Installation is the reverse of removal. Finally, refill the cooling system.

To replace the Engine Coolant Temperature (ECT) sensor, drain the cooling system. Then, disconnect the cable(s) from the negative battery terminal(s). Before installing the sensor, encase the threads with Teflon tape to stop leaks. For HEMI engines, remove the drive belt and unbolt the air conditioning compressor to access the ECT sensor. Encase the threads with Teflon sealing tape before installation. Finally, refill the cooling system.

Remove the accessory drive belt, unbolt the air conditioning compressor, and set it aside without disconnecting any air conditioning pressure or return line fittings.

For the throttle body temperature sensor, remove the air cleaner, disconnect throttle cables, remove the accelerator cable bracket, unplug the electrical connector from the sensor, remove the sensor, apply heat transfer compound, install the sensor securely, and reverse the steps for reinstallation.

The ECT sensor is located at the left end of the engine, near the throttle body and EGR valve.

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 ECT sensor is located at the left end of the engine on the coolant adapter housing.

When the ignition switch is turned to Start and the starter motor is turning, the indicator light should come on, indicating a good bulb.

If an overheating indication occurs, you should check the coolant level and ensure all connectors in the wiring harness between the sending unit and the indicator light or gauge are tight.

The ECT sensor is located at the front of the engine block, under the air conditioning compressor.

When the ignition switch is turned to START and the starter motor is turning, the indicator light (if equipped) should come on, indicating a good bulb.

The ECT sensor is located at the front of the intake manifold.

To a level slightly below the cylinder heads.

Refill the cooling system.

The sensor is located on the left side of the front of the cylinder head.

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

Remove the drivebelt and unbolt the air conditioning compressor to access the ECT sensor.

Wrap the threads with Teflon sealing tape to prevent leaks before installing the sensor.

When the ignition switch is turned on and the starter motor is turning, the indicator light should be on to indicate an overheated engine.

The Engine Coolant Temperature (ECT) sensor, which also functions as the coolant temperature sending unit, provides information to the Powertrain Control Module (PCM).

Start by partially draining the cooling system, then disconnect the cable from the negative battery terminal.

The Engine Coolant Temperature (ECT) sensor, which also functions as the coolant temperature sending unit, provides information to the Powertrain Control Module (PCM).

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

Start by partially draining the cooling system, disconnecting the cable(s) from the negative battery terminal(s), and disconnecting the electrical connector from the ECT sensor.

Refill the cooling system.

When the ignition switch is turned to START, the indicator light should come on, indicating a functioning bulb.

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