Why shouldn’t you pour plain tap water into your car’s radiator?

Something about liquids freezing and gases and solids. Thanks



  1. 0 Votes

    Engine coolant has a higher boiling point and lower freezing point than water, meaning that it can withstand a broader range of temperatures than water in an engine.  So, if you live in colder climates and put only water in your engine, there is a good chance the engine block will crack when the water freezes in the pipes.  Similarly, coolant can hold more heat without boiling over, making it more effective for keeping engines cool.  Additionally, minerals in tap water can corrode engine parts quite easily.  Coolants have corrosion inhibitors to avoid this. 

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