What direction do the fans typically work? Drawing into the engine? If so, how would you be pushing air out if you're moving forward? You'd be fighting the air coming into the engine bay, and you'd be putting hot air over the radiator. If you were idling, and both fans were operating this way, it could work, I think, but I don't know enough to say you'd see a benefit from running them in different directions. You could test it at idle by just powering it off the battery, right? I imagine they're 12VDC fans? Just get some wires and touch them to the battery.
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