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

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

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Automobile Engineering in ME
The auto ignition in a spark ignition engine means

Ignition of the charge before the passage of flame front
Ignition induced by the passage of a spark
Automatic ignition of the charge at the end of compression
Ignition induced to supplement the process of normal combustion

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