Originally Posted by maxcichon
I don't have a coupe, so I will make suggestions that are very general.
- Very carefully inspect the main rubber gasket. Either for a flattened area or actual damage. A cut or puncture.
- There are drain ducts under the wing. Make sure they are clean. I believe that they start in the oval "cups" where the hinges are anchored. The exit of these are the round rubber holes under the lip by the release catch. Compressed aire to blow them out (careful!) might work well.
- I hope not, but maybe (worst-case scenario) a leak around the glass. I really doubt this would be it-I think you would be the first.
Happy hunting, and let us know what, if anything, you find?
Thanks Maxcichon for the answers. I tried blowing those drain ducts under the wing. They sounded clean. I just blew from underneath (the exit holes) while holding my thumb on the drain ducts. No dirt or other particles found. I will check window and thr rubber gasket, the rubber gasket looked okay though... will try again. I went to the dealer today to get the repair kits for the seat heater. That will be my weekend project.
wish me luck!