AC/Heater Fan Noise!
 

I just bought an '09 370Z with just over 11K miles that has one annoying problem. The AC/Heater fan makes a fluttering kind of sound which gets louder the higher I turn it up. The AC still works fine and even if I have the AC off and am just running the fan, it still makes that sound. I plan to bring it in to the dealer to check it out since it's still under warranty but would like a little heads up before I get there. Thanks!