What is the purpose of the fan shroud?

• A. Increases engine horsepower
• B. Reduces radiator clearance
• C. Increases the fans effectiveness
• D. Protects the radiator from debris

Answer: (C)

A fan shroud’s job is to direct and concentrate the airflow from the cooling fan through the radiator. Without a shroud, air tends to take the path of least resistance around the edges and the radiator fins don’t get as much of the cooling air, so heat transfer is reduced. The shroud encloses the fan and seals the gap to the radiator, forcing more air through the radiator fins and increasing cooling efficiency, especially at low vehicle speeds where ram air is limited. It may also offer some protection against debris and from contact with the fan, but its primary purpose is to make the fan more effective at moving air through the radiator.