BMW: 1986 mint 325 6 cyl water leak from front end, waterhose, footwell

Question
this situation has just recently started. If I park on a flat surface the rain comes in the passenger side front and rear. If I park on a hill it does not happen. had it looked at several times but no luck. need some advice please!

Answer
Ed,
 I know that leaves can get in the vents in front of the windshield and block off the drains and cause and overflow of water to come into the passenger's area.

 The floor boards can get we a few ways.  Right below the passenger's footwell, there is a big plug (5" diameter) this plug gets knocked loose some times, and allows water to spray up underneath the carpet.  IF you can, raise the car and check out these large plugs.

 Other than that, you will need to trace the leak out.  Sit in the car and watch for leaks, or have someone use a waterhose and spray all the seals around the glass

 Good luck,
 Josh