What are the functions of coolant?

2 Answers
DiRylee
07/25/25 10:40am
Coolant functions: 1. Circulate in the engine cooling system to carry away excess heat generated during engine operation, enabling the engine to operate at normal working temperature; 2. Has a higher boiling point and lower freezing point than water, providing antifreeze protection; 3. Corrosion prevention, as coolants contain a certain amount of anti-corrosion additives to prevent corrosion in the cooling system; 4. Prevents the formation of deposits such as scale. The full name of coolant should be antifreeze coolant, meaning it has antifreeze functionality. Coolant consists of three components: water, antifreeze, and additives. Based on the antifreeze component, it can be classified into alcohol-based, glycerol-based, ethylene glycol-based, and other types of coolants.
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KateFitz
08/11/25 7:48pm
Coolant has many functions indeed. Having driven for over ten years, I know this best. It absorbs engine heat, preventing overheating during high-speed driving or climbing hills, and avoids cylinder burning in summer. Anti-freeze is crucial in winter, ensuring it doesn't freeze at low temperatures to protect the radiator and pipes. It also raises the boiling point, preventing boiling and overflow in high temperatures. The anti-corrosion function is vital, with added chemical components to protect metal parts from rust, extending engine life. It lubricates the water pump to prevent wear. I recommend regularly checking the fluid level and color, replacing it every two years to maintain cooling system efficiency. Neglecting it will increase overhaul costs—safety first.
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