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open up a door and pour some water (low pressure high volume) on the window from outside, inspect that ALL water is exiting from the door drains and not the interior panelling. If it is then inspect the vapor barriers. My W124 had the foggy issue sometimes, found out that the RR and FL door barriers were torn. New ones cut from 6 mil plastic solved the problem.
My car also was suffering from missing rubber plugs in the rear wheelhouse causing a flood of water sometimes.
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2012 BMW X5 (Beef + Granite suspension model)
1995 E300D - The original humming machine (consumed by Flood 2017)
2000 E320 - The evolution (consumed by flood 2017)
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