What does coolant mean in a car?

[McDylan]

Coolant in a car refers to antifreeze, and this English word is typically found on the expansion tank of the car's antifreeze system. The full name of antifreeze is antifreeze coolant, and its primary function is not to prevent freezing but to cool. Antifreeze prevents the coolant from freezing in cold winter conditions when the car is parked, which could otherwise cause the radiator to crack or damage the engine cylinder block or head. Antifreeze is a type of coolant containing special additives, mainly used in liquid-cooled engine cooling systems. It offers excellent performance in preventing freezing in winter, boiling in summer, and resisting scale and corrosion throughout the year. The effective lifespan of antifreeze is usually two years. It should be replaced when it expires or if the coolant becomes dirty. During replacement, it is essential to completely remove the old coolant, add clean water, start the engine, and let it idle for about ten minutes to circulate and clean. After stopping the engine, the clean water should then be drained.