What does it mean when a car displays 'Check Coolant Level'?

[PaisleyAnn]

When a car displays 'Check Coolant Level,' it indicates that the coolant is either low or the coolant temperature is too low. The full name of coolant should be antifreeze coolant. Coolant is not only used in winter but should be used in all seasons. In normal car maintenance, the engine coolant should be replaced once a year. If the antifreeze in the car is low, the car's dashboard will issue an alert. In this case, it is necessary to stop the car promptly for inspection. After the engine's water temperature drops, the coolant level should be checked, and if it is low, it should be replenished immediately. If the coolant level is normal, you should go to a repair shop or a car 4S store for inspection. The device that detects antifreeze consists of two electrodes. When the antifreeze level is below the electrodes, the circuit cannot conduct, and the car's computer uses this signal to determine that the antifreeze is insufficient, which causes the coolant warning light to illuminate.