Why is water used as a coolant in car radiators?

Water is used in tropical countries and anti freeze is used in countries which have a winter with temperature reaching in the minus degrees to prevent the water pump from freezing during a cold start, Water is used because it does not exceed the temperature above 100 deg. C no matter how hot the engine is it will try to maintain the temp of the engine to 125 deg C. In the cylinder area.

Using distilled water is advisable because all the calcium and impurities are removed which helps the seals and bearings from premature wear. More.

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