What are the functions and principles of automotive antifreeze?
2 Answers
Antifreeze has excellent properties such as preventing freezing in winter, boiling in summer, preventing scale and corrosion throughout the year. The working principle of antifreeze is that when antifreeze or water is mixed with engine oil, it produces oil sludge and gum, weakening lubrication and causing the hydraulic valve pushrod and piston rings to stick. Composition of antifreeze: The main components of antifreeze are 50% purified water, 40% methanol, and 10% other substances. Antifreeze replacement cycle: For vehicles that operate for long periods, such as taxis, high-quality antifreeze should generally be replaced once a year. For vehicles with shorter operating times, it can be replaced every two years or every 30,000 kilometers. To prevent excessive foam formation, which reduces the heat exchange efficiency between the antifreeze and engine components, ensure the product is within its validity period when adding it. Long-lasting antifreeze can have a validity period of up to three years. If suspended matter, sediment, deterioration, or discoloration is found in the antifreeze, it should be replaced promptly, and the system should be cleaned.
As an experienced driver who frequently hits the road, I'd like to discuss the role and working principle of coolant. This stuff plays a dual role in my car: protecting the engine from freezing in winter and preventing overheating in summer. Without it, water in the radiator could freeze and cause damage in sub-zero temperatures, or the engine might overheat and produce steam under high temperatures – neither scenario is a minor issue. The principle of coolant is to add ethylene glycol and similar additives to regular water, altering its properties – lowering the freezing point to dozens of degrees below zero and raising the boiling point to prevent boiling; it also forms a protective film to reduce rust and scale buildup. From my experience, regular coolant changes (about every two years) can save you from expensive radiator or water pump repairs, not to mention avoiding the risk of breaking down on the road. Additionally, getting the concentration right is crucial – neither too thick nor too thin; I often use a refractometer to ensure the proper mix.
