I have problem with my fan.Yersterday the fan was working fine.Today i turned up the PC and the fan of the car is not starting!!I don't know why!!Please someone help me!!
Its bearings may have finally given out or become clogged with dust. If you are not able to replace the entire card, you should be able to find a relatively inexpensive aftermarket cooler to replace the fan.
I don't think I've ever been able to clean a fan like that. The hub blocks access to the bearings, so even if they aren't worn out I'm not sure how you'd clean it. If you feel resistance when you turn it manually, perhaps getting some WD-40 in there will help. Otherwise, something like http://www.newegg.com/Product/Product.aspx?Item=N82E16835999029 should be sufficient to cool that card.
The cooler should have installation instructions.
You could try a small local computer shop; they might have something they could do for you, perhaps give you a working fan off an old card.