What does the dashboard display 'Check Coolant' mean?

[Edgar]

The dashboard displaying 'Check Coolant' is a reminder to add coolant, which may be caused by coolant leakage or a faulty water level sensor. The method for adding coolant is: 1. Unscrew the radiator cap, open the radiator drain valve to release the coolant; 2. Insert a rubber tube into the radiator filler neck and flush the cooling system with water; 3. After flushing, let the engine idle until clear water is discharged. The functions of coolant are: 1. To reduce the heat energy generated by the engine; 2. To prevent the engine radiator and cylinder block from cracking due to expansion; 3. To prevent corrosion of metal components and aging of rubber parts; 4. To prevent clogging of the circulation pipes.