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Heavy truck development is characterized by increasing engine performance, torque and payload, which increases the demand of using hydrodynamic retarder for braking. At the same time there is a demand of reducing exhaust gas emissions and noise and increasing comfort and driving safety. As a consequence manufacturers of heavy duty trucks are demanding higher performance from their cooling systems with less available space in the vehicle. To meet these needs, a novel high performance compact cooling system was developed. This system differs from conventional systems in that it utilizes a radial arrangement of the cooling components that allows up to 1.4 times more heat transfer surface to be installed in the same space with all air side surfaces working at ambient temperature.