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True, you can use a boost converter, or some other form of voltage increasing circuit. However, once you put a load on that fan, its rpm is going to plummet. That fan I linked to creates an airflow of 1730 cfm @ 12.7A. How much airflow do you think you have? Say you get a very generous 1000 cfm through your radiator at 60 mph. The fan is only going to capture a fraction of that airflow for energy generation. A DIY wind turbines is about 30% efficient, so you get 300 cfm captured for generation. That would give you 2.2A of charge (assuming no other losses, and there will be other losses). Is it worth the hassle for 2.2A? That is a right around 30W. A 30W solar panel isn't that big, goes for about $65 shipped to your door, and it would be way easier to hook up, plus it charges when you aren't going 60 mph, and it even charges when you aren't even driving...
I'm not saying it can't be done. I'm saying its not worth the time. There are other things that would be much better alternatives and give you larger gains.
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