What is the function of automotive antifreeze?
2 Answers
Antifreeze is a type of coolant containing special additives, primarily used in liquid-cooled engine cooling systems. It offers excellent performance in preventing freezing in winter, boiling in summer, and providing year-round protection against scale and corrosion. The method for replacing antifreeze is as follows: Before completely replacing the antifreeze, conduct a thorough inspection to check for any signs of leakage or cracks in the pipes, with a particular focus on the five-way water pipe. Antifreeze is distributed to different parts of the car through the five-way pipe to perform its function. If there is any leakage of antifreeze in this section, replace the water pipe or reseal the joints as necessary. Drain the old antifreeze, then flush the liquid channels with clean water. Add clean water to the antifreeze reservoir and continue filling until water flows continuously through the engine cooling system. Start the engine and let it idle for 3 to 5 minutes to circulate the water. Initially, the water flowing out of the reservoir may have a faint pink tint. Continue adding clean water until the outflowing water is clear. Remember to disconnect the heater hose and drain the water from the heater core. Approximately one hour after draining, add the new antifreeze through the radiator hose. Then, add another container of antifreeze to the antifreeze reservoir until it is nearly full. Start the engine and let it run for about 10 minutes. During this time, the coolant level will drop slightly as air is expelled from the cooling system. Top up the antifreeze to the "MAXT" mark on the reservoir.
As a veteran driver with twenty years of experience, I believe antifreeze serves far more purposes than just preventing freezing in winter. During scorching summers, it efficiently cools the engine, avoiding risks of overheating like cylinder explosion or engine failure. In freezing winters, it lowers the freezing point of the coolant to dozens of degrees below zero, preventing pipes from freezing and cracking. More importantly, antifreeze contains anti-corrosion additives that prevent rust in the radiator and pipes, extending the lifespan of the entire cooling system by at least several years. Long-term use also inhibits scale formation and electrolytic corrosion, keeping metal components intact. I’ve also found that regularly checking fluid levels and concentration is crucial—if the color changes, it’s time for a replacement, typically every two years or 50,000 kilometers. Don’t underestimate this stuff—it’s essential year-round. Using water as a substitute accelerates corrosion and wastes money. In short, antifreeze is a key little helper in car maintenance, keeping my vehicle running smoothly and safely.
