something to do with A/C??
 

So last week my car started making this really weird loud sound almost like (the timing chain was broken) from under the hood towards the front of the engine. I didn't want to chance ruining anything so I had it towed to my mechanic. He looked at it and though he was extremely busy said it was something to do with the a/c seeing as he removed the a/c belt and the noise stopped! Seeing as I don't need a/c at this time of year he agreed to look at it at a later time and investigate it.. what do you guys think it could be, as of now the car runs perfect without w/e the belt worked..