Why do you put antifreeze in the car?

You put anti freeze in your car for 2 reasons. 1 Reason is to keep your engine operating temperature at the specifide level and keep the engine from over heating. The other Reason is to protect your engine block from craking in extreme cold. When liquid freezes it expands and could potentialy crack a weak engine block. Anti freeze does not become solid till around -50F. Also, anti freezes contain additives which reduce corrosionwithin the engine and the rest of the cooling system.