4384565 | Genuine Cummins® Coolant Temperature Sensor 6.7L ISB & QSB

Monitor engine temperature

• The sensor measures how hot or cold the engine coolant is.

Control fuel mixture

• When the engine is cold, the computer adds more fuel.

• When the engine is warm, it uses less fuel for better efficiency.

Control the cooling fan

• When the engine temperature gets too high, the sensor signals the computer to turn on the radiator fan.

Prevent engine overheating

• By monitoring temperature, the system can help protect the engine from overheating.

Provide dashboard temperature reading

• It sends information to the temperature gauge or warning light on the dashboard.

Help reduce emissions

• Proper temperature control helps the engine burn fuel cleanly and efficiently.

Check Engine Light

• The check engine light may turn on if the sensor sends incorrect signals to the engine computer.

Engine overheating

• If the sensor fails, the cooling fan may not turn on when needed, causing the engine to overheat.

Poor fuel economy

• The engine may use too much fuel because the computer thinks the engine is cold.

Hard starting

• The vehicle may be difficult to start, especially when the engine is cold.

Rough idle or poor performance

• The engine may idle roughly, run unevenly, or lose power.

Cooling fan running all the time

• Sometimes the fan stays on constantly, even when the engine is not hot.

Incorrect temperature reading

• The temperature gauge on the dashboard may show wrong readings (too hot or too cold).