Sounds like it's the front a/c that you are talking about. It goes to the passenger side of coach, then back to the rear of the refrigerator, down thru the house floor into the waste tank bay, across the top of the waste tanks to the drivers side and down thru the basement floor. It can be seen by removing the utility bay cover or looking under the coach by the utility bay. There are two 1/2 pex lines there, one for the rear fresh water tank overflow, and the other is the front a/c drain.
Jim & Sandy
2008 34' FDDS Alpine