Which component is primarily responsible for cooling the engine?

The radiator is primarily responsible for cooling the engine. In an internal combustion engine, heat is generated as a result of fuel combustion and friction between moving parts. To prevent overheating, the engine is equipped with a cooling system, of which the radiator is a crucial component.

The radiator works by transferring heat from the engine coolant to the air outside the vehicle. Coolant circulates through the engine block, absorbing heat, and then moves to the radiator where it is cooled down by air flowing through the radiator fins. This cooling effect allows the engine to maintain an optimal operating temperature, preventing potential damage that could be caused by overheating, such as warping of engine components or failure of gaskets.

In contrast, the oil pump, throttle body, and fuel injector serve different functions in the engine. The oil pump is responsible for circulating engine oil to lubricate moving parts, the throttle body controls the amount of air entering the engine, and the fuel injector delivers fuel to the combustion chamber. While these components are essential for the engine's overall operation, they do not play a direct role in the cooling process, making the radiator the correct answer to this question.