Gainward GTS 250 strange fan sound

Hi all! My GPU fan squeals on 35- 40% of speed. If I stop it by hand this sound continues for 1-2 second and then disappears. Anyone know how to fix this?

try to open it and clean it.Some times dust can acumulat on the wings , wich may be the cause of the noise

sounds like theĀ fan bearing's are toast (thats to be expected from a card thats bean around since 2009)