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I don't think drilling an exta hole is a good plan, however if you already have an opening for cooling air that goes through the radiator you could use any energy left in the radiator exit flow to drive a mini air tubine then duct the exit air from the mini turbine to a low pressure area it might work. The experament is well worth a try. If nothing else you will find out what doesn't work. The process will teach you a whole lot of other stuff that may become useful in some other experament.
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