It's a tube that runs from the lower left side of the evaporator box (under dash passenger side) through a hole in the I-beam island. If it can't drain, condensed water fills the box, eventually sloshing out the heater vents. Will ruin your carpet if water is allowed to puddle (remember -- pontoon is made of plastic). Tube is actually two joined pieces: one inside the car, one next to the frame. My external hose was pinched so badly at the factory it is now permanently deformed. I simply omitted (don't give me a bunch of grief -- the frame is epoxy coated. If it can't stand a little condensed water, what does that say about Lotus). Word of warning -- don't pull the hose loose soon after running A/C. Niagara Falls could be waiting in the box. This is a wet voice of experience talking... Bill Robertson #5939 >--- In dmcnews@xxxx, "Marvin" <marv@xxxx> wrote: > A DeLorean-owner-friend without a computer has asked me the following: > - where is the a/c drain plug that may be plugged causing moisture on both > the driver's and passenger side floor carpets? > > Marv > # 17707 > marv@xxxx