I had just dropped off my son leaving my car on during the time, I went 4 or 5 blocks and then noticed a noise starting that sounding like a cowbell noise, so I pulled over and opened up the hood and noticed a wire moving around and hitting a few belts. It honestly sounds like something came loose or broke loose. But I am not for sure.
Rattling noise, kind've sounding like a cowbell like noise on 2000 Dodge Caravan
by CaraAmber85 in Nevada, MO on May 20, 2011
ANSWER by Johnny Mopar on May 31, 2011
It is possibly related to the belt and / or the belt tensioner. how old are the belt? they should be replaced at 60K intervals or sooner.