Cummins ISX11.9 CM2250 – Service Manual 019-019   Engine Coolant Temperature Sensor

Connect INSITE™ electronic service tool.

Verify the coolant temperature reading on INSITE™ electronic service tool and the gauge reading are the same.

WARNING  Do not remove the pressure cap from a hot engine. Wait until the coolant temperature is below 50°C [120°F] before removing the pressure cap. Heated coolant spray or steam can cause personal injury.

WARNING  Coolant is toxic. Keep away from children and pets. If not reused, dispose of in accordance with local environmental regulations.

• Drain the cooling system. Refer to Procedure 008-018 in Section 8.

The coolant temperature sensor is located near the thermostat housing, on the rocker lever housing.

Lift up on the locking tab and pull the electrical connectors apart.

Remove the sensor.

Make sure the new sensor has an o-ring installed.

Lubricate the o-ring with clean engine oil.

Install the new sensor into the engine. Tighten the sensor.

Push the connectors together until they lock.

WARNING  Coolant is toxic. Keep away from children and pets. If not reused, dispose of in accordance with local environmental regulations.

• Fill the cooling system. Refer to Procedure 008-018 in Section 8.
• Operate the engine and check for leaks.
• Use INSITE™ electronic service tool to monitor the engine coolant temperature sensor for proper operation.