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

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

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Automobile Engineering in ME
The difference between DOT 3 and DOT 4 brake fluids is

DOT 3 and DOT 4 fluids have the same boiling point, but DOT 4 fluid has a longer service life
DOT 4 fluids have a higher boiling point than DOT 3 fluid
DOT 4 fluids have a lower boiling point than DOT 3 fluid
DOT 4 fluid is more resistant to freezing than DOT 3 fluid

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