Has anyone had a problem with water seeping in around the rear window? It rained all day on Monday while my car sat out in the parking lot; while backing into the garage at home, I noticed a water mark (it was very wet) on the ceiling in the back (passenger-side); it appears to be leaking where the window meets the metal of the roof of the car; there's black rubber stripping between the window and the roof of the car; my A4 Quattro is now 5 years old and everything seems to be going wrong now that it's a year past warranty -- just replaced the battery last month!

 

Turns out it is not the rear window seal that is leaking; it's the drain hose from the sunroof which is clogged and will take 5 hours of labor to disassemble, replace the hose and reassemble$$$

 

Check Audiworld as there was a write-up on how to clear clogged sun roof drains. You should not have to replace the drain hose(s) and 5 hours is not needed.

 

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Try that before spending a lot of money disassembling anything.