Evans air conditioner leaks water!

[Guinnessecco]

I just purchased a 1978 21 footer American Clipper, bathroom in the back. It has an Evans air conditioner that leaks water down through it when it rains.  Not just a little, but alot.  The water collects in a shallow aluminum trough (narrow basin) that surrounds the exit for the conditioned air.  When it accumulates sufficiently it pours down through the air conditioner.  Is this an air conditioner which is used on other American Clippers??  Does anyone have experience with this problem??  I thought I fixed it by unplugging the drain holes, but it still leaks badly!  HELP!  This is a very nice RV, but I have had three RV's and have never had this problem - thought with a fiberglass body and roof I would not have leaks!  I cannot use it until I fix this problem.  Yes, the air conditioner does cool.....
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