Engine - Coolant Temperature Sensor/Switch: Service and Repair

ENGINE COOLANT TEMPERATURE SENSOR

REMOVAL
3.7L V-6





The Engine Coolant Temperature (ECT) sensor on the 3.7L engine is installed into a water jacket at front of intake manifold near rear of generator (Fig. 10).

WARNING: HOT, PRESSURIZED COOLANT CAN CAUSE INJURY BY SCALDING. COOLING SYSTEM MUST BE PARTIALLY DRAINED BEFORE REMOVING THE COOLANT TEMPERATURE SENSOR.

1. Partially drain the cooling system.
2. Disconnect the electrical connector from the sensor.
3. Remove the sensor from the intake manifold.

4.7L V-8

WARNING: HOT, PRESSURIZED COOLANT CAN CAUSE INJURY BY SCALDING. COOLING SYSTEM MUST BE PARTIALLY DRAINED BEFORE REMOVING THE ENGINE COOLANT TEMPERATURE (ECT) SENSOR.





The Engine Coolant Temperature (ECT) sensor on the 4.7L V-8 engine is located near the front of the intake manifold (Fig. 11).
1. Partially drain the cooling system.
2. Disconnect the electrical connector from the ECT sensor.
3. Remove the sensor from the intake manifold.

5.7L V-8








The Engine Coolant Temperature (ECT) sensor on the 5.7L engine is located under the air conditioning compressor (Fig. 12). It is installed into a water jacket at the front of the cylinder block (Fig. 13).

WARNING: HOT, PRESSURIZED COOLANT CAN CAUSE INJURY BY SCALDING. COOLING SYSTEM MUST BE PARTIALLY DRAINED BEFORE REMOVING THE COOLANT TEMPERATURE SENSOR.

1. Partially drain the cooling system.
2. Remove fan belt.
3. Carefully unbolt air conditioning compressor from front of engine. Do not disconnect any A/C hoses from compressor. Temporarily support compressor to gain access to ECT sensor.
4. Disconnect electrical connector from sensor (Fig. 13).
5. Remove sensor from cylinder block.

5.9L Diesel





The Engine Coolant Temperature (ECT) sensor on the 5.9L diesel engine is located near the thermostat housing (Fig. 14).

WARNING: HOT, PRESSURIZED COOLANT CAN CAUSE INJURY BY SCALDING. COOLING SYSTEM MUST BE PARTIALLY DRAINED BEFORE REMOVING THE COOLANT TEMPERATURE SENSOR.

1. Partially drain the cooling system.
2. Disconnect the electrical connector from the sensor.
3. Remove the sensor from the cylinder head.

INSTALLATION
3.7L V-6
1. Apply thread sealant to sensor threads.
2. Install sensor to engine.
3. Tighten sensor to 11 Nm (8 ft. lbs.) torque.
4. Connect electrical connector to sensor.
5. Replace any lost engine coolant.

4.7L V-8
1. Apply thread sealant to sensor threads.
2. Install sensor to engine.
3. Tighten sensor to 11 Nm (8 ft. lbs.) torque.
4. Connect electrical connector to sensor.
5. Replace any lost engine coolant.

5.7L V-8
1. Apply thread sealant to sensor threads.
2. Install sensor to engine.
3. Tighten sensor to 11 Nm (8 ft. lbs.) torque.
4. Connect electrical connector to sensor.
5. Replace any lost engine coolant.

5.9L Diesel
1. Install sensor to engine.
2. Tighten sensor to 18 Nm (13 ft. lbs.) torque.
3. Connect electrical connector to sensor.
4. Replace any lost engine coolant.