You are right, there is a drain tube for the condensation that runs out of the evaporator box underneath the car. This is clogged and the condensation is not finding its way out.

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Ali Al-Chalabi

2001 CLK55
1999 Dodge Ram 2500 Cummins Diesel
2002 Harley-Davidson Fatboy
Merlin Extralight w/ Campy Record