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
No, it is not recommended to put salt water in a car radiator as it can lead to corrosion and damage to the radiator, water pump, and other components of the cooling system. It is best to use a coolant mixture of water and antifreeze specifically designed for car radiators.
At the radiator or overflow tank. Do not add water, add coolant.
You don't put water in your radiator, you put antifreeze.
Get a new radiator or flush it out?
No, use a 50/50 mix of distilled water and the correct antifreeze depending on the model car you own.
No. Let it cool down before you open the radiator cap and then put water in the radiator
the thick liquid would plug your radiator and ruin your water pump. and destroy your engine.