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Good work mate. Looking forward to seeing out on the roads soon. We might have to rouse up a few Rollas for an inauguration cruise for you haha

some of the more "advanced" fan shrouds have rubber flaps over holes in the shrouds or even plastic flaps on hinges. so when the car is not moving the fan pulls a small vacuum between the radiator and shroud and keeps the flaps closed to pull as much air through the radiator. but when you start moving and there is more air flow than the fan is pulling then the flaps open. exhibit A: http://www.motoiq.com/MagazineArticles/ID/3990/PageID/9619/Project-Viper-GTS-Part-5--Radiator-Fan-Wiring-Upgrade.aspx