Why does the engine need coolant?

The main reason an engine needs coolant is to ensure it operates efficiently within the appropriate temperature range, preventing damage caused by overheating or excessive cooling.

Coolant serves multiple functions in the engine.

Cooling effect: The coolant absorbs a large amount of heat generated during engine operation through circulation and carries it to the radiator for dissipation, thereby preventing the engine from overheating.

Freeze Protection: In cold weather, coolant lowers the freezing point of water, preventing it from solidifying and avoiding the expansion in volume that could crack engine blocks, radiators, and other components.

Corrosion prevention: The coolant contains anti-corrosion additives that protect metal components in the engine cooling system, preventing corrosion and extending service life.

Scale prevention: The coolant can reduce the formation of scale from minerals such as calcium and magnesium in water, ensuring the cleanliness and efficient operation of the cooling system.

Lubrication: The coolant lubricates the water pump and thermostat, ensuring the engine operates in good condition.

The replacement interval for coolant is generally every two years or 40,000 kilometers, but the specific cycle should be determined based on the vehicle maintenance manual or actual usage conditions. Prolonged failure to replace the coolant may lead to a decline in its performance or even corrosion of engine components, making regular replacement very important.