Cooling System: A cooling system is designed to remove a part of heat generated inside the cylinder that may be harmful to engine parts. The heat is produced in the engine cylinder by the burning of fuel. A part of this heat is converted into the useful energy. But the remaining part of heat that cannot be utilised has to be discharged properly from the engine and surrounding parts, otherwise it might be a cause of serious problems in the engine like piston seizure.
A part of unutilised heat escapes with the exhaust gases and lubricants but still some extra heat has to be removed and this part of unutilised heat is removed by the cooling system.