What type of fluid typically flows from the engine to the radiator in a car's cooling system?

In a car's cooling system, the fluid that flows from the engine to the radiator is coolant. This specialized fluid is designed to absorb heat from the engine, helping to regulate its temperature and prevent overheating. The coolant then travels to the radiator, where it dissipates the absorbed heat into the air, allowing the engine to maintain an optimal operating temperature.

Coolant is typically a mixture of water and antifreeze, which not only helps it to retain heat but also protects the engine and cooling system from corrosion. Proper functioning of the cooling system is crucial for engine performance and longevity, as overheating can lead to significant damage.

Other fluids mentioned, such as transmission fluid, fuel, and brake fluid, serve very different purposes within a vehicle and do not play a role in the cooling process. Transmission fluid is used for lubricating and cooling the transmission, fuel powers the engine, and brake fluid is essential for the braking system's hydraulic function.