Look down the left frame rail by heat controls valve. There are 3 or 4 heater hoses to the outside of intake manifold down low. If you are smelling the antifreeze inside the car, it may be the heater core giving out. Is the fluid level down in the expansion tank?
You could have a leaking radiator. Pinhole from internal corrosion, or debris causing an external leak. You might see steam coming from the area once it gets hot. If you can see the radiator, an old motorcycle trick is to spray it with foot powder so any moisture becomes easier to see. Or remove it, take it to a radiator shop to pressure test and potentially repair.
Look for any white residue on all hoses, connections, fittings etc. you may have gotten lucky in that you smell the antifreeze in the engine space. If fluid level is down, there must be residue left somewhere. Now you just get in there and dig with a good light.
It's crazy because I've looked all over for steam when he car is hot and nothing. I will try looking for the residue. Another thing is that the fluid level is exactly where it's supposed to be according to the stick.
A forum community dedicated to BMW owners and enthusiasts. Come join the discussion about Bimmerfest events, production numbers, programming, performance, modifications, classifieds, troubleshooting, maintenance, and more! Bringing the BMW community together.