What is the primary function of a vehicle cooling system?

The primary function of a vehicle cooling system is to keep the engine from overheating. Engines operate efficiently at a certain temperature range, and as they run, they generate a significant amount of heat. If this heat is not managed properly, it can lead to engine damage or failure. The cooling system, which consists of components such as the radiator, water pump, and thermostat, helps to regulate the engine's temperature. By circulating coolant through the engine, it absorbs excess heat and then dissipates it through the radiator, allowing the engine to maintain optimal operating temperatures for optimal performance and longevity.

Other options pertain to different functions: circulating oil is important for lubrication, providing heat to the passenger cabin is a secondary function of the cooling system, and charging the car battery is managed by the alternator, not the cooling system.