Pontiac Repair: 2003 Montana A/C drain plugged, body seams, water leaks

Question
2003 Montana with all the possible options dual air, back-up sensors, pwr side doors.
The A/C drain must be plugged, it puddles in the drivers side carpet. Do you know of a fix or possible direction I could start looking?
I also have the courtesy lights intermittently flickering, everything seems to work correctly. Maybe the two problems are related, wires sitting in water?

Answer
Hi wayne:

Water leaks suck to find! These van's ave a few prone areas to leaks. The a/c drain could be plugged where it goes through the fire wall? The body seams at the rear whell well area to the floor pan are noted for leaks as well. Pull up the carpet and see if the water is clear like rain water or muddy dirty where it could be kicked up from the wheel that will leak you in a better direction. The problem is that the van sits higher in the rear then the front so all the water runs towards the front so if you had a leak in the rear it shows up up front. You could have a windshield leaking as well.
good luck :}