Not a good idea unless it's an emergency! The salt in the water will quickly corrode an alloy or aluminum engine, so if you have to do this get the system flushed out as soon as possible.
Water
When a car is hot, keep the car running and add water to the radiator. When a car is cold, you can simply put the water into the radiator.
when the enjine was turnoff sometime and then open the radiator and fill it
Circulating water will not be sufficient and the car will overheat.
the antifreeze runs through all your water lines in your car . . . . you put it in your water tank or radiator
At the radiator or overflow tank. Do not add water, add coolant.
You don't put water in your radiator, you put antifreeze.
No, use a 50/50 mix of distilled water and the correct antifreeze depending on the model car you own.
Get a new radiator or flush it out?
No. Let it cool down before you open the radiator cap and then put water in the radiator
The engine of a car contains many passages through which water can flow. The water picks up excess heat from the car engine and then passes through the radiator, where it is cooled by the rapid flow of air. The cooled water then returns to the engine to pick up more excess heat. So to put it simply: the radiator cools the water which cools the engine.
the thick liquid would plug your radiator and ruin your water pump. and destroy your engine.