Cool the Engine when it is overheated

A friend of mine went to Genting Highlands last week. On the way up to Genting, her husband car's engine was overheated and force them to stop at the side of road so wait for the enigne to cool down. I never thought of this problem before "How if a car engine overheated at the half way to Genting Highlands " ? How to cool the engine when it is overheated?

I asked my friend whose husband is a mechanic, and he shared some valuable opinion to me as below...

1. Turn off the engine and open the hood. Pour water on the outside of the radiator itself.

2. Take about 20minutes to wait for the engine to cool significantly before opening the tank to add coolant ,look at the coolant reservoir to check the coolant level.

3.if the level is below the low line, use a funnel to add coolant to the reservoir. You have to call a tow truck if a low coolant level is not the problem.