Automobile Engineering in ME
The purpose of a thermostat in an engine cooling system is to

Indicate the coolant temperature
Prevent the coolant from boiling
Allow the engine to warm up quickly
Pressurise the system to raise the boiling point

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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 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
It draws heat out of the engine compartment

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