Some radiators have two heat exchangers, one for the engine and one for the:

The correct answer focuses on the fact that some radiators are designed with dual heat exchangers to effectively manage the cooling of different components within a vehicle. One heat exchanger cools the engine coolant, while the second is specifically for the transmission fluid.

This dual setup allows for more efficient temperature regulation, as both the engine and transmission generate significant heat during operation. Proper cooling of the transmission is crucial because overheating can lead to transmission failure, reduced performance, and costly repairs. By including a dedicated heat exchanger for the transmission, the system ensures that fluid temperatures remain within safe operating limits, which enhances the overall reliability and longevity of the vehicle.

In contrast, while components like air conditioners and brakes also generate heat, they do not typically utilize the radiator's heat exchangers for cooling purposes in the same manner as the engine and transmission.