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Old 01-15-2013, 08:53 AM
Blacklane Blacklane is offline
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Location: Springfield, Ohio, USA
Join Date: Jun 2011
Posts: 1,992
Mein Auto: 1998 Z3 Roadster
My personal experience with wet carpet under a seat was from a leaking inner door seal. If you remove the inner door panel, there is a foam or plastic sheet held in place with butyl tape. That butyl seal fails and allows water to run behind the door panel and into the car. It is hard to see the leak because it is hidden by the inner door panel.

Others have found a leak from the heater vents under the windshield:

A simple pitcher of water or a hose is usually all you need to isolate leaks.
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