losing antifreeze on 2001 BMW 330xi

losing antifreeze when car is running no leaks visible or white smoke from exhaust. losing quite a bit with nothing visible. any answer would help. thanks

2 answers
That antifreeze/coolant has to be going somewhere. Get your vehicle to a reputable shop and have them pressure test your cooling system to determine where that leak is.
I second Tyreguy's opinion. You need to take it to a shop where the car can be pressure tested.

Zee