What are the functions of coolant?
3 Answers
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.
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.
From a mechanical perspective, the functions of coolant include thermal management, freeze protection, and system maintenance. It efficiently transfers heat by circulating through the system to carry engine heat to the radiator. The ethylene glycol-based formulation lowers the freezing point to prevent ice formation in subzero conditions, while raising the boiling point to avoid high-temperature failure. Corrosion inhibitors protect aluminum and iron components from oxidation and rust. It lubricates water pump bearings to reduce failure rates. I often emphasize that mixing different brands can compromise performance, so selecting the correct type (e.g., OAT or IAT) and regularly testing pH levels is crucial. Long-term use minimizes sediment buildup, preventing clogs and enhancing engine reliability.
