I had a similar problem on the bedroom window on my FL36. I leaked for quite a while without really knowing where it came from until it started leaking on the inside of the window. Time to do something, so I googled youtube and ended up taking the whole window out and replacing the butyl tape around the outer edge. It's a fairly large window so it 3 of us to get this done.
Actually the original job was quite sparse on the tape, obviously the source of the problem.
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2021 GM Denali HD 3500 Dually Diesel 4x4
2014 FL36
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