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Efficient thermal management of an engine cooling system and its surrounding components has been one of the most frequently visited topics in automotive industry. Especially, modern diesel truck engines have to deal with more heat rejection than ever to meet the rigorous emission and efficiency standards. As the maximum heat dissipated by a cooling system is limited to available inlet area to radiator, which is constrained by cab configuration, it is crucial to maximize the cooling airflow availability under given conditions. To be able to do so means to avoid additional development cost accompanying an altered cab configuration. At the same time, truck manufacturers have to deal with reduced product life cycles and develop reliable products economically.