Automobile Engineering in ME
The function of a radiator fan in the cooling system is that

It cools the engine by blowing air onto the cylinder block
It blows air through the radiator when necessary
It draws heat out of the engine compartment
It is turned by wind force as the vehicle moves forward, and its rotation drives the water pump

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Automobile Engineering in ME
The function of a second ring is that it is a

Cushion ring which prevents piston slap and knock
Compression ring and aids the top ring in sealing and cooling
Back up oil control ring which will work in place of the bottom ring when it is broken
Back up compression ring which will work in place of the top ring when it is broken

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