Automobile Engineering in ME
The main function of a resonator is that it

Regulates the intake air temperature
Regulates the intake air flow rate
Enhances intake efficiency
Reduces the intake air noise

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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 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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