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seriuos off road trucks usually run fans in the pickup bed, but I fail to see the benefits on a road going vehicle. Since the radiator needs airflow, might as well bleed a little off the high pressure area on the front of the vehicle. It's the extra air that hurts the aerodynamics. Standard radiator placement usually also minimizes the radiator hose run.
Old Saab 92b's run radiators behind their 2 cycle 2 cylinder engine. This is vented to the cab as the heater core.
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