Why does the Mercedes-Benz display a coolant refill prompt when the coolant level is normal?

[McSilas]

The reasons why a Mercedes-Benz shows a coolant refill prompt when the coolant level is normal are as follows: 1. High coolant temperature: The driver should immediately find a suitable location to stop and observe. If the water temperature is high, the engine should be shut off immediately. After allowing it to cool for a while, contact a repair facility as soon as possible for inspection and maintenance. Note that if the engine is experiencing excessively high water temperature, do not continue driving, as this risks damaging the engine. 2. The signal transmitted by the vehicle system indicates low coolant level: If it is confirmed that the coolant level is normal and the engine water temperature is also normal, the alarm is likely caused by incorrect coolant level or water temperature signals. In this case, it is necessary to check whether the sensors and wiring are functioning properly and whether the control unit's program has any errors.