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The Radiator Fan in Chevrolet Astro is used in maintaining proper engine temperature by controlling the flow of air through the radiator. It consists of a fan blade, a mounting shroud and a motor which is located close to the radiator in order to cool hot coolant before the coolant is circulated back into the engine. Mechanical as well as electric fans are used in Chevrolet Astro models. Mechanical radiator fans are attached to the water pump shaft and rotate with the help of the crankshaft, with a thermal clutch to prevent gear whining at high speeds and to save fuel. On the other hand, electric fans are powered by a 12V motor and they are controlled by coolant temperature or the air conditioning system, to ensure the premier airflow through the radiator and the condenser. Both the fan types incorporate shrouds that are important in the management of the airflow required for the engine operation.