So I just got sent a new Wii from the factory when they couldn't fix my old one. As luck would have it the one they sent me has both a messed up sd slot and a broken cooling fan.... Anyway, are the fans on the Wii console-specific, or could I just get any generic pc case fan with a 2pin molex for the power? "Wii replacement fans" seem like a huge waste of money.

If by "they" you mean Nintendo, why don't you call them and let them try again to give you a working Wii?

I don't know, it's functioning but it just shuts off when the wifi is in use for a while. If I keep a fan next to it I have no problems. Anyway, does anyone know the answer to my question?

I think it is a 40x40mm fan, if you find a pc fan with three pins you can connect two and still have it working, the third is just for rpm monitoring.