Quote:
Originally Posted by EcoCivic
That’s the whole point of adding flaps. At speeds where the fans aren’t needed anymore, say 40+ MPH, the fans and shroud could block the natural airflow through the radiator. The point of flaps with holes behind them is to allow natural airflow through the shroud when driving at higher speeds when the fans aren’t needed. The flaps get sucked closed when the fans are running when stopped or at low speeds and they get pushed open from pressure in the shroud when driving at higher speeds. I just don’t know if it would help much since there isn’t a lot of my radiator that is covered by the shroud, most of it is covered by the fans.
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Forced air will pass right through the fans and even turn them. If you had a way to measure, you would maybe see a little power generation. You're fine. I vote no flaps.