A car radiator is a heat exchanger that transfers heat from the engine coolant to the air. The coolant flows through the radiator's tubes, while air flows over the tubes. The fins on the tubes increase the surface area of the radiator, which helps to transfer more heat from the coolant to the air.
Black objects absorb more heat than other colors, so a black radiator will absorb more heat from the coolant. This helps to keep the engine cool.
In addition, a black radiator will dissipate heat more quickly than a radiator of another color. This is because black objects emit more infrared radiation than other colors. Infrared radiation is a type of electromagnetic radiation that is not visible to the human eye, but it can be felt as heat.
Therefore, a black radiator will absorb more heat from the coolant and dissipate it more quickly than a radiator of another color. This helps to keep the engine cool.
