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Message: <blockquote data-quote="Vincent Hor" data-source="post: 379859" data-attributes="member: 1221">Check your acond condensation outlet hose area. Quite likely the culprit. Last time while I was working on the complete engine conversion of the Red E34 from M20 to M50 I noticed that this area is the weak point. Don't be surprised to see rust and a big hole there.  You practically need to remove most of the carpet to get to the area. My analysis on how this could happen is actually via the transmission tunnel under the car. BMW are known for good sound proofing. If you hoist up the car you will see the aluminium proctection plate running across the transmission and prop shaft tunnel. On top of this aluminium protection plate lies a layer of sound proofing material. When your car go over water puddle water is  splashed over this area and it stays wet/damp for a long time thus resulting in rusting this area. When it gets bad enough water will seep through and onto the carpet.</blockquote>