It's hard to diagnose noises over the Internet. When you say the serpentine belt is okay, I'm assuming that it isn't glazed and isn't too loose or too tight. The answer may depend on whether the noise you are hearing is a squeal or chirp or a whirring or rumbling noise.
It seems the usual problem with this era Town & Country is the belt tensioner. If you remove the serpentine belt, you can spin the tensioner pulley and the idler pulley by hand. There will be some resistance but you shouldn't hear any noise, and it should spin smoothly. While you are checking this, you can do the same test with the alternator.
The second tier of things to check would include the vibration damper, water pump, and the power steering pump.
Failing that, you could see if turning on the AC changes the sound. That would add some load to the belt since turning on the AC engages the AC compressor, and could change the sound you are hearing. That may indicate that it's actually a bad AC pulley causing the sound.
Source: Chrysler Town and Country EX/LX/LXi/Limited forum (http://townhall-talk.edmunds.com/direct/...)
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