1997 Chevy Cavalier CAR NOISE PROBLEM

Noises problem
1997 Chevy Cavalier 4 cyl Automatic 12500 miles

MY CAR MAKES A CHAIN NOISE LIKE A BUNCH OF CHAINS IS RATTLING TOGETHER, SOMEONE TOLD ME THAT IT SOUNDS LIKE MY AIR CONDITIONER IS GOING OUT WOULD IT MAKE THAT KIND OF NOISE OR COULD IT BE SOMETHING ELSE