Can Water and Antifreeze Be Mixed?
2 Answers
It is not recommended to mix antifreeze with water. The specific reasons are as follows: 1. Anti-corrosion function: The engine and its cooling system are made of metal, including copper, iron, aluminum, steel, and solder. These metals, when in contact with cooling water at high temperatures for extended periods, can corrode and rust. Antifreeze not only prevents corrosion to the engine cooling system but also has anti-corrosion and rust-removal functions. 2. Higher boiling point of antifreeze: The boiling point of water is 100 degrees Celsius, while high-quality antifreeze coolant typically has a boiling point above 110 degrees Celsius, making it suitable for high-temperature environments in summer. 3. Antifreeze prevents scaling: Using water as a coolant can lead to scaling issues. Scale deposits on the metal surfaces of the radiator and water jacket reduce heat dissipation efficiency over time and are difficult to remove. High-quality antifreeze is made with distilled water and contains anti-scaling additives, which not only prevent scaling but also have descaling capabilities.
I've been driving for over twenty years and often encounter cooling system issues. Water and antifreeze can indeed be mixed, but you must use the right type of water. For example, in winter, if the antifreeze concentration is too high and risks freezing, diluting it with water is acceptable—but only with distilled or soft water. Never use tap water or mineral water. The calcium and magnesium ions in tap water can react with the additives in antifreeze, leading to rust in the radiator and clogged pipes over time. I've personally seen cases where engines overheated due to this, costing owners a fortune in repairs. The correct approach is to regularly check the coolant level. If a top-up is needed, prioritize using pre-mixed coolant. If none is available, blend distilled water and antifreeze in a 50-50 ratio. This protects the water pump and radiator, extending the vehicle's lifespan. In summer, improper mixing can also lower the boiling point, causing smoke during high-speed driving. So don’t cut corners by carelessly adding water—regular maintenance is key.
