What does checking car coolant mean?

[VonJulia]

Checking car coolant refers to the situation where the engine water temperature is too low, requiring the car to be warmed up before driving. Once the car is warmed up, the warning display will naturally disappear. Coolant, also known as antifreeze, prevents the coolant from freezing and cracking the radiator or damaging the engine cylinder block during cold seasons when the car is parked. In regular car maintenance, the engine antifreeze should be replaced every year. Functions of coolant: 1. Winter antifreeze: After parking in winter, coolant prevents freezing, which could otherwise cause the radiator and engine block to crack. 2. Anti-corrosion: Corrosion in the cooling system can lead to failures in the radiator's lower tank, fuel injector sleeves, cooling pipes, joints, and radiator tubes. 3. Scale prevention: The coolant minimizes scale formation during circulation to avoid clogging the pipes and affecting the cooling system's heat dissipation function.