The plastic or metal component that helps protect the fan and channel air through the radiator is the fan:

• A. Fan
• B. Radiator
• C. Cap
• D. Shroud

Answer: (D)

The shroud is the plastic or metal housing around the cooling fan that protects the blades and directs airflow through the radiator core. By surrounding the fan, it prevents air from sneaking around the edges of the radiator and ensures the air drawn by the fan actually passes through the cooling fins, which boosts cooling efficiency, especially at low speeds or when the vehicle isn’t moving fast. It also serves as a safety barrier, protecting the fan from debris and reducing the chance of injury if someone reaches into the engine bay. The radiator itself is the heat exchanger, the cap seals and pressurizes the system, and the fan’s job is to move air; the shroud’s role is to channel and protect that airflow.