Either the AC switch is stuck in the "on" position or perhaps the drain is almost plugged which gives the appearance of water dripping even when the AC is not on? Where is the windshield wiper tank located? Perhaps that is leaking. Though I seem to remember the windhshield wiper tank was on the passenger side on my 2000 T&C. I believe the AC drain is towards the passenger side of the firewall - that's where it's located on most of the Mopar's I've owned.