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coolant is a mixture of antifreeze and water (usually 50/50)

If you were to use just water, you would not have either freeze protection or overheat protection.

Water freezes at 32 degrees. Antifreeze could protect engine to -20 to -30 degrees.

Water (with no pressure) will boil at 212 degrees. Antifreeze will delay "boil-over" to a much higher temperature (I am not sure of number)

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Q: Why do you add antifreeze to the coolant?
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