The engine will overheat and the pistons will seize.
There is a warning light which flashes when the engine begins to overheat.
The answer will depend on what engine it is and what it is being required to do.
It will overheat the engine
The car's engine will soon overheat without some kind of fluid in the radiator. I'm taking off my coat before I overheat.
The engine will overheat.
Definitely
generally if an engine overheats, but then does not overheat when heater is turned on, is a good indication that the engine thermostat is stuck and needs replacing
Having a leak in a radiator hose will have no effect on the engine running or not. However, in time the hose leak will cause the level of the coolant in the radiator to drop below a critical level and the engine will overheat.
The engine is overheating.
If you allow the engine to overheat severally, yes.
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.
Yes. There could be several reasons for engine to overheat.