Hey, My rMBP 2013 15" fans spin up sometimes and get really loud, for 10-15 seconds, then just spins down again. It doesn't really bother me, except when it happens in class, when I'm just taking notes. So I was thinking I'd get some sort of manual fan control for that. I just want to make sure that it cant damage anything? They spin up for a reason, right? Will my computer overheat or whatever if I don't let it cool itself as it wants, even though I'm not really putting pressure on the hardware?..