[Erich]

I had the same problem on my '94 E34, both sides, looked at AC drains, vents, etc., but finally found it was leaking WINDSHIELD sealant! I have an ultrasonic leak detector which uses a little battery powered ultrasonic emitter, and a detector. I put the emitter on the dash, and with the trim strips around the windshield pulled off I ran the detector around the outside windshield edges and found leaks at most of the clips that hold the trim strips on. I siliconed around each clip, until the detector found no more leaks, and that stopped the wet carpet!
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Versuch doch mal so einen Ultrasonic Leak Detector zu bekommen und Teste. Auch interessant, wo bei dem das Wasser durchkam.