[Sjkane57]

Can anyone tell me what the most probable cause would be for finding a wet (very wet) floor on the passeger side? it not a coolent leak. The car has been sitting for some time.

 

[njlou]

Most likely you have a moon roof rainwater drain clog. The subject is well covered in these threads.
Also check your trunk/spare tire area for water. If your electronics have not been moved, you could have problems due to water damaging the electronic modules located there.
This subject is also covered in these threads.

 

[BMW technician]

BMW tech here,,,if you are talking about the front passengers floor area,,,,it could be the sunroof water drain or the front passengers door panel vapor barrier could be leaking,,,,,my blog page bmwtechnician

 

[H F]

There are scuttle drains under the cabin filters . One is under the ebox and the other is just under the master cylinder . If they get clogged with leaves and dirt . The compartment fills with water and drains in the floor boards ...

Here is one under the master cylinder .

 

[Sjkane57]

Thank you

Thank you both for the responce. I found the pluged drains.