Automobile Engineering in ME
The main function of intake manifold is that it

Cools the intake air to a suitable temperature
Promotes the mixture of air and fuel
Reduces intake noise
Distributes intake air equally to the cylinders

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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 cools the engine by blowing air onto the cylinder block
It draws heat out of the engine compartment
It blows air through the radiator when necessary

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