Automobile Engineering in ME
The problems caused by the wheel imbalance are

Hard steering and hard ride
Steering wheel vibrations and uneven tyre wear
Poor acceleration and hard steering
Poor acceleration and reduced fuel efficiency

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

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
It draws heat out of the engine compartment

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