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Radiators are installed in automobiles to remove heat from the coolant. The use of higher output engines with tightly compacted under hood packaging, the addition of new emission components, and aerodynamic front end styling with narrower openings are creating a hostile thermal environment in the engine compartment. This results in a smaller volume of under hood cooling air. So, to handle higher volume flow rates of air axial flow fans are used to cool the radiators. These fans consume considerable amount of power from the engine and hence the performance of the axial flow fan is an important parameter of the efficiency of the engine cooling system. CFD is used as a major design tool to investigate major issues related to the performance of fan, like volume flow rate and static pressure rise etc. The present work investigates the characteristics of the flow over axial flow fans, which are used for radiator cooling, using CFD code FLUENT 6.0.