Is 90 Degrees Celsius Normal for Cummins Engine Coolant Temperature?

[MacEmery]

The normal operating temperature is around 90°C. Below are the common causes of overheating: Insufficient coolant: Coolant leakage can cause temperature rise. In this case, check for any signs of coolant leakage. If found, promptly repair the leaking pipes or components. If no leaks are detected, replenish with the same brand of coolant. Adding water is not recommended, especially in winter, as it can dilute the coolant even if it doesn't cause immediate malfunctions. Radiator fan malfunction: A faulty radiator fan may prevent proper heat dissipation during high-speed operation, causing heat to accumulate instead of transferring to the antifreeze. This leads to increased antifreeze temperature and potential boiling-over issues. If this occurs while driving, first reduce vehicle speed. Inspect whether the fan is functioning properly. If faulty, repair it immediately rather than waiting for the coolant to boil.