Is the water pump in good shape?
Check to see that it is full of water, Even if it was before, It may not be after the thermostat opened,
Is the fan working?
Is the engine in good shape, A bad timing chain or the ignition timing being off can cause excessive heat.
When your radiator fails in a car, your car will overheat. Sometimes it will explode with steam. Usually you lose your radiator coolant. Often you will have to replace your 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.
You will see coolant pouring from it and your car will overheat
Try changing the themometer
The car's engine will soon overheat without some kind of fluid in the radiator. I'm taking off my coat before I overheat.
Your car will leak anti-freeze/coolant. If you run out of fluid in your radiator then your car will overheat in a short period and cause much more damage. Fix your radiator!
For radiator leaks look for the following signs: The car will overheat Coolant level will frequently drop Pool of coolant or water under the car radiator Obvious leak noted from radiator on starting the car Faulty radiator cap causing the leak
The radiator cooling fan is most likely not working.
Not for very long, the coolant will splash out to a point where it will overheat.
Yes, a car needs a radiator to run because it stores the coolant for the engine and dispenses it when needed. So, if it didn't have one the car would overheat and not be able to move :)
Fixer pluged radiator or caused thermostat to stick shut.