Chrysler Repair Questions? Ask a Mechanic for Answers ASAP
If the noise is present in the exhaust while idling you could kick the tailpipe, while the engine is off and if it makes a noise get under the vehicle and ask someone else to kick the tailpipe so you can try to pinpoint where the noise is coming from.
As far as the belt goes, you could try spraying some water on the belt while it is running and listen if the noise changes. The water should temporarily shrink the belt making the noise change or maybe even go away. It's only a test though, so don't think water is going to fix it although if the water does make the noise go away and the belt is tight, some stuff called "belt ease" may help the noise go away.
Another thing to try is to remove the belt or belts one at a time, then start the engine and listen if the noise went away. If so, check the pulleys associated with that belt so feel if any make that noise while spinning either by hand if you can spin them or if there is a belt tensioner, try a new tensioner.
Did you get rid of those noises?