What is the primary purpose of a vehicle's radiator?

The primary purpose of a vehicle's radiator is to dissipate heat from the engine coolant. As the engine runs, it generates a significant amount of heat due to combustion and friction. The coolant absorbs this heat and is then circulated to the radiator, where it is cooled down before returning to the engine. This process ensures that the engine operates within an optimal temperature range, preventing overheating and potential engine damage.

While enhancing engine performance, filtering impurities from engine oil, and providing pathways for exhaust gases are important functions in a vehicle, they are not the main role of the radiator. The radiator's specific function is crucial for maintaining engine temperature, which is necessary for efficient combustion and engine longevity.