What is the composition of antifreeze?
2 Answers
The main components of antifreeze are 50% pure water, 40% methanol, and 10% other substances. Types of antifreeze: Antifreeze is generally divided into three types: ethanol-water type, glycerol-water type, and ethylene glycol-water type. Methods for selecting antifreeze: The basic indicators of antifreeze are the freezing point and boiling point. The freezing points of antifreeze available on the market include -15°C, -25°C, -30°C, -40°C, etc. It is generally advisable to choose one that is at least 10°C lower than the lowest temperature in your region. Methods for replacing antifreeze: Before completely replacing the antifreeze, conduct a thorough inspection to check for any signs of leakage or cracks in the pipes, with a focus on the five-way water pipe. The five-way pipe is named for its five connecting interfaces to various parts. Antifreeze flows through the five-way pipe and is then distributed to different parts of the car to function. If there is any leakage of antifreeze in this part, the water pipe should be replaced or the interface should be re-secured as needed. Drain the old antifreeze, then flush the liquid channels with clean water. Add clean water to the antifreeze reservoir and continue to inject water into the reservoir, allowing the water to flow continuously through the engine cooling system. Then, start the engine and let it idle for 3 to 5 minutes to circulate the water. The water initially flowing out of the reservoir may have a faint pink color. Continue injecting clean water until the water coming out is clear. Note: Do not forget to remove the heater hose and drain the water from the heater. After about an hour of draining, add the new antifreeze through the radiator hose, which allows the antifreeze to flow quickly into the radiator. 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. At this point, the coolant level will drop slightly as some air is expelled from the cooling system. Add more antifreeze until it reaches the "MAXT" mark on the reservoir.
The main components of antifreeze are ethylene glycol and water, with ethylene glycol accounting for the majority, such as half or more, which effectively lowers the freezing point of water, making it less likely to freeze in winter. Additionally, the water contains additives like corrosion inhibitors and rust preventatives, such as phosphates or ethylenediaminetetraacetic acid, which protect the internal engine parts from rust and corrosion. The ratio control is crucial; too much ethylene glycol can affect cooling efficiency, while too little reduces antifreeze capability. I recommend using the manufacturer's recommended formula. Antifreeze comes in different colors: green is the traditional type, while red represents the organic acid technology type, which is more durable after upgrades. Regular replacement is essential, typically every two years or 50,000 kilometers, to ensure the car's engine runs smoothly in cold weather and to prevent radiator bursts or other issues. Personally, I make it a habit to check it every winter.
