Went out to our 99 'Burb this morning, getting the 3rd row out and ready for a trip to town. Happened to put my hand on the carpet at the passenger side barn door and it's wet. Now, I know this is near the heater box, but what's the chances of the doors leaking? It doesn't smell like antifreeze, but then again this still has the DexCool in it. I'm not really sure how to go about looking for leaks in this situation. I figured it'd have the little drain that lets the coolant flow outside the body like the front heater core does if that was the cause. Any suggestions?