Yeah I don't know. It's the big CoolerMaster fan in the middle of the case. There's a fan on each side of it, one of them makes a nasty sound.. assuming bearings are going or some ****. If it was a normal fan, I would've replaced it years ago.
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That's the CPU cooler. It's kind of important. If it's not working, replace it. Luckily, they're cheap, plentiful, and easy to swap out. What CPU/chipset do you have? (i3, i5, i7, whatever-the-hell AMD makes, LGA1150, LGA1155, etc)