what makes water to boil and leak from the radiator
It is called coolant that flows threw the engine to keep the engine from overheating. The engine temperature is controlled by a thermostat that could be stuck closed not allowing the coolant to flow the cooling system. Other causes would be low on coolant, a bad water pump, a plugged radiator, or a bad head or head gasket, which usually happens once a engine overheats.
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