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Fan Shroud

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If you run a belt-driven fan, you need to have a proper fan shroud to pull the air through the radiator instead of around it. The blades should be half in and half out of the shroud for optimum airflow, and there should be approximately one inch of clearance between the tip of the fan blade and the shroud opening. This area can be a problem for off-road vehicles with a lot of flex between the engine and the radiator.