2002 BMW 745i Questions

All 2002 BMW 745i Questions

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After car gets warm it cuts off.I can crank it back up but keeps turning off.
I was driving and had to turn back home the car lost power if you please would let me know what you think it is I would really apreciate
Nothing in the of the dash works the button of the flashers nor the heat
I've notice water on the floor on passenger side and would hear the sound of water at the center console moving back and forward. Where is it coming from and how do I fix it?
Car has black heavy smoke after driving a few miles; very obvious at stops.
I have a new battery and alternator.