About 3 days ago my cooling fan started to make a horrible 'woosh'ing noise when it runs. Since it's belt driven the noise increases w/ the RPMs. It's so loud I can barely hear the radio when the engine's running over 3,000rpm. Sounds like a hurricane or deranged vacuum cleaner under the hood.

I checked, and it's definitely the cooling fan making this terrible noise, and there are no leaves or squirrels in it. Has anyone else had this problem? The car seems to run fine despite the noise. Is there anyway to fix this thing?