+1I believe it is for the windshield washer heater...but not positive.
I do know that it mounts onto the passenger side wheel well black cover. The one that hangs down past the bumper in front of the wheel.
See the black cover on the passenger side? There is a circular opening on the bottom of it. That's where it screws into.
yes thats how you can tell is when your temp says something ridiculousGet it from Tischer BMW. They are pretty common to be ripped out if you hit something kind of big on the road.
So I assume you don't have one on the driver's side, too? That is probably why your car is displaying -40*.