Can Water Be Added to Antifreeze?

2 Answers
DeKevin
07/24/25 4:54am
Antifreeze can be mixed with an appropriate amount of soft water. About 95% of antifreeze is ethylene glycol-based water coolant. Ethylene glycol is a colorless, slightly viscous liquid that can be mixed with water in any proportion. After mixing, the vapor pressure of the coolant changes, significantly lowering the freezing point. Do not add tap water to antifreeze, as tap water tends to produce scale. You can add an appropriate amount of distilled water or soft water, but only in moderation. Adding too much will increase the freezing point of the antifreeze. The primary purpose of antifreeze is to transfer heat to the radiator during engine operation and dissipate the heat to maintain the engine's normal working temperature. When replacing antifreeze, it is advisable to have it done at a 4S shop or a professional repair shop. When topping up antifreeze, try to use the same product as the vehicle to avoid chemical reactions.
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ElleLynn
08/11/25 12:30am
As a DIY car maintenance enthusiast, I believe adding water to coolant requires caution. Generally, manufacturers recommend a 50% coolant to 50% water mixture ratio, which provides both freeze protection and engine cooling. Never use tap water or well water directly - the minerals can cause radiator corrosion and sediment buildup, eventually clogging the cooling system. I've tried adding distilled water in emergencies, but that's only a temporary solution. It's best to regularly check coolant concentration using a hydrometer. With winter approaching, insufficient coolant concentration may freeze and damage the engine, leading to costly repairs. Don't cut corners by just adding water - the safest approach is to purchase pre-mixed coolant from auto shops or follow the manufacturer's instructions precisely.
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