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

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

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Automobile Engineering in ME
The purpose of a balancer shaft is to

Increase inertia force of the rotating crankshaft
Balance the timing in the movement of the two groups of pistons
Reduce vibrations caused by the crankshaft rotation
Adjusts the timing of the intake and exhaust valve openings

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