Automobile Engineering in ME
A worm gear is used as the pinion for the rack and pinion type of steering gearbox, because it

Makes the steering more responsive
Reduces the amount of kickback for large steering angles
Allows the steering wheel to be turned by a greater amount when steering
Improves steering comfort when steering wheel is turned to effect small changes in the direction of forward motion

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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 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
It blows air through the radiator when necessary

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