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Getting the information on the inlet airflow and volume through the radiator was the important factor for the estimation of engine cooling performance. Now we developed an improved method of calculation by using STAR-CD, with improved fan modeling and a more precisely shaped vehicle model which includes the cab, front grill, radiator and engine, etc.. In this model, we can calculate more simultaneous airflow in the engine compartment and finally estimate more precisely the cooling performance by using a heat transfer calculation program, KULI. In this paper, we report on the newly developed CFD modeling method and calculated results.