Main Components and Function The cooling system consists of several key components, including the radiator, water pump, thermostat, cooling fan, and coolant fluid. The coolant circulates through the engine, drawing heat away and transferring it to the radiator, where air flow cools it down before it recirculates. The thermostat controls the flow of coolant to maintain consistent operating temperatures. Together, these components ensure the engine operates safely under various driving conditions, preventing damage and improving overall vehicle reliability.