Yeah glad the water hose worked for you. Now that you know where it is leaking from you just need to get her fixed. I personally have never had a pop rear 1/4 window car so I do not have any knowledge of fixing this but I will take a stab at it and guess that the easiest fix would be to replace the oem weatherstrip for that window....It shouldn't be all that hard to do either. The part you are needing to replace is #2 on the link posted along with the part number in the list with a price(approx) Hope this helps
http://www.realoem.com/bmw/showparts...66&hg=51&fg=05
http://www.realoem.com/bmw/showparts...66&hg=51&fg=05


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