If it is making a noise while it is running it could be a leaf or something in the blower. You can easily drop the blower and check it out. There was all kinds of stuff in mine.

However, my noise was something totally different. It was making a clunking noise only when I turn the blower on and off. It would spit out a couple clunks and then stop making the noise. It ended up being a HVAC door/flap way behind the dash. It was broken but everything is ok now. From what the dealer told me, they had to remove the whole dash to get back there (or at least slide the dash back). If anyone has any questions, email me....