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A radiator on a component wind tunnel will not perform as in the engine compartment due to the many mitigating factors: the water pump, the fan power, and other vehicle components like the grill, air inlet cross sectional area, bumper position, ram air, pressure coefficient at the front end and at the air outlet of underhood. A simple engine cooling system simulation model has been modeled allowing to predict the influence of each component listed above. The calculation results have been compared to the wind tunnel test results on seven different vehicles.