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

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

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Automobile Engineering in ME
The path taken by intake air is

Air cleaner carburettor (or throttle body) intake manifold intake ports cylinders
Carburettor (or throttle body) air cleaner intake manifold intake ports cylinders
Air cleaner carburettor (or throttle body) intake ports intake manifold cylinders
Air cleaner intake manifold carburettor (or throttle body) intake ports cylinders

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