The Work of a Fan in an Automobile Engine

"I wanna know the function of a fan in an automobile engine."

Step 1: Locate a friend who has access to an automobile.
2: Convince friend that he should open the bonnet, allowing a view of the engine.
3: Convince friend to start the engine.
4: View the fan in action; form a theory.
5: Review textbooks for theory confirmation.

Curiosity, my friend. What makes it go, what does it do, how is it made...

I love the English language:) A bonnet is such a nice term for the hood of the car. I thought the fan just created a nice breeze...

an automobile engine is a device to transfer thermal energy by burning diesel or benzene fuel and this thermal energy is transported to mechanical energy unfortunately this conversion cannot not be 100 % efficient so some of the heat energy needs to be transfered to the engine environment for the engine to work properly .for example engine body is made of a steel alloy which cannot stand much the heat generated during the firing stroke so the engine is cooled by a medium which is water generally to keep the water below its boiling point well below 80 or 90 c we use the fan to force draft air on air/water heat exchanger(radiator ).so the fan main job is to take away the heat from the cooling medium which is water . and keeps its temperature below boiling point at 80 or 80 C .

And whats the fan do?

The function of a fan in an automobile engine is to cool the heat exchanger (radiator) that cools the automobile engine. And maybe the transmission as well.

Its a lot more complicated than that, but that can wait.

I'll assume you mean the fan in the engine compartment rather than the one fan (blower) in the passenger space?the one in the engine bay pulls (not pushes) air through the radiator to cool the coolant that keeps the engine from over heating

Not so fast. Most electric fans are mounted in front of the radiator these days, so they do push the air.

Engine mounted fans pull air, not that the OP cares.

PS

I hope you're feeling better.