looked underneath the car and saw no holes or gashes where water would seep through underneath the drivers seat

(doesnt happen on the passenger side)

and saw nothing....

the water runs from underneath the black rubber material beneath the carpeting of the drivers foot area all the way back to the rear seat carpeting

hasnt seeped above the carpets, but only below....

any ideas where to check?

87' e300td

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'87 E300D Turbo OM603 - ALDA/Trap Oxidizer/Center Muffler Deleted, Wastegate Adj. (13psi)