Can Windshield Washer Fluid Be Used as Antifreeze?
2 Answers
Windshield washer fluid cannot be used as antifreeze because it is not antifreeze. Simply put, antifreeze is used for engine cooling, while windshield washer fluid is for cleaning the windshield. The full name of antifreeze should be antifreeze coolant, meaning it is a coolant with antifreeze properties. Antifreeze prevents the coolant from freezing in cold winter conditions, which could otherwise cause the radiator to crack or damage the engine cylinder block or head. Windshield washer fluid, on the other hand, is commonly known as car windshield cleaning fluid. Functions of Antifreeze: Antifreeze is a coolant containing special additives, primarily used in liquid-cooled engine cooling systems. It has excellent properties such as preventing freezing in winter, boiling in summer, and resisting scale and corrosion throughout the year. Can Different Antifreezes Be Mixed? It is necessary to use the same brand of antifreeze. Different brands of antifreeze may have varying production formulas, and mixing them could lead to chemical reactions between the additives, rendering them ineffective. How to Choose Antifreeze: The basic indicators of antifreeze are its freezing point and boiling point. On the market, antifreeze comes in several specifications with freezing points such as -15°C, -25°C, -30°C, and -40°C. Generally, it is advisable to choose one that is at least 10°C lower than the lowest temperature in your region.
Having worked in the auto industry for years, I often see customers asking if windshield washer fluid can replace antifreeze. The answer is a firm no. Windshield washer fluid is primarily made of water and alcohol, designed for cleaning windshields, whereas antifreeze is specifically formulated for engine cooling systems. It contains ethylene glycol to prevent freezing and boiling, while also offering rust and corrosion protection. If you mistakenly use washer fluid, its chemicals can corrode the radiator, hoses, and water pump, leading to cooling system blockages or leaks, engine overheating, or even complete failure—repairs can cost thousands. Additionally, washer fluid has poor freeze resistance and may freeze at low temperatures, expanding and damaging the system, potentially causing safety hazards. I recommend car owners regularly check their antifreeze's freeze point and replace it before winter—never risk saving small money at a high cost.