If your vehicle's engine overheats while driving in heavy traffic, what should you do?

1. Pour cold water directly over the hot engine block immediately, so the cold water cools the metal down as quickly as possible while the engine keeps running.
2. Turn on the heater to draw heat away, pull over safely, switch off the engine, and let it cool before checking the coolant.
3. Keep driving fast to increase airflow through the radiator.
4. Slam the hood shut and ignore the warning light.