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I believe water causes metal to rust. Even if its an aluminium block your radiator is made from iron some times and some others copper.The boiling point of Clean water(H20) is100 degrees Celsius or212f, With all the salts like Magnesium, calcium and chlorine(in tap water) you can have it boil at less than85 celcius. These salts deposit after after long use of water( same whitish stuff you seee at the bottom of kettles)and the deposits clog your cooling lines and stresses the water pump.As water boils it expands and also releases gases dissolved in it.Gas expansion due to heat is way more than liquid expansion. Your car cooling system is a close system and this expansion causes pressure build up. At some point some thing has to give way, either the water pump, hose, or radiator.Coolant is made up of mainly TEG ( Tri ethylene glycol) and silicates. TEG has a boiling point above320f and low expansion due to heat. New cars have a shuf off system that would tun off the engine when temp rises above a certain point.Pls do not use water if you want your engine to last long
