A blown head gasket or a cracked cylinder head.
Or a cracked oil cooler ( if equipped )
low anitfreeze, no water, busted headcap
There are several causes that will reduce the water level in your car radiator. The most common cause is evaporation. Engine overheating will also reduce the radiator water level.
A bad water pump or thermostat can cause an engine to overheat. A plugged (clogged) radiator or heater core may also cause an engine to overheat.
Water is needed to stop the engine from overheating.
If you mean engine coolant is getting into the car, the heater core is leaking coolant causing the coolant level to drop and that causes the engine to over heat.
it circulates the water throughout the engine and the radiator, keeping your engine from overheating
Engine is overheating.
Thermostat probably needs replacing They can stick not allowing enough water to flow around the engine block If the engine overheats it can warp the head or blow the head gasket
loose water pump pulley and overheating engine
there can be several reasons, however it is usually due to overheating and/or sudden cooling --- such as overheating the engine and then pouring cold water into the radiator, etc. Occasionally, the engine manufacturer may have a flaw in the head casting or too thin metal, etc that will cause it to crack too.
They do fail naturally but the some causes are engine overheating because of water pump failure, pressure problems in the head and water cooled oil coolers splitting and blocking the circulation leading us back to point 1.
stop an engine