As soon as I cranked my car This morning I heard a LOUD rattling noise under my hood. It was incredibly loud. I lifted the hood and it looks like the problem might be coming from AROUND the fan belt. It didn't increase or decrease when I cut my heater on. And it was so loud that when I pulled up to work, everyone in my office heard my car. Please help! I have a video but I don't see an option to post!

 

What make, model and year audi do you have? and if you go to the advanced option on the post, you can 'manage attachments' and upload a video.