HELP PLEASE

[Z4bruno]

My z4 2003 3.0 leaks coolant from my lower hose when I open my radiator cap does anyone know why this could be?
I add coolant and it all just leaks come straight out from the bottom of the reservoir tank/ lower hose. I also have a threaded bleeding screw that belongs to the radiator itself

 

[bigwinn]

I’d say without seeing it that your expansion tank has split

 

[bigwinn]

https://phpbb.z4-forum.com/forum/download/file.php?id=106345

 

[enuff_zed]

My z4 2003 3.0 leaks coolant from my lower hose when I open my radiator cap does anyone know why this could be?
I add coolant and it all just leaks come straight out from the bottom of the reservoir tank/ lower hose. I also have a threaded bleeding screw that belongs to the radiator itself

Welcome to the forum. Hopefully we can help fix your car, virtually anyway.
I'd agree it is most likely to be the expansion tank split, or as I had, the O-ring seal in the bottom wasn't sealing anymore.
If you say whereabouts you are, you may find someone who can help out.