What does the submarine symbol displayed on the car mean?

[StEverett]

The submarine symbol displayed on the car indicates that the water temperature is too high. More information about high water temperature is as follows: 1. Coolant: If you find that the water temperature is too high due to coolant loss, you can add a small amount of distilled water as an emergency measure (Note: Do not open the radiator cap when it is hot, as there is a risk of burns). 2. Long-distance driving: For high water temperature caused by long-distance driving, you can pull over, turn on the hazard warning lights, and let the vehicle cool down naturally. 3. Damaged cooling fan: You need to find a nearby repair shop for inspection as soon as possible. 4. Damaged thermostat: When disassembling, the small circulation should be blocked to ensure that all the coolant is cooled by the radiator.