hahh... this radiator bleeding process is really crappy by german standards!!!..imagine, u have to top up ur rad, start ur engine, peep at the damned water level with the reservoir cap OFF, keep adding water till the water comes out of the aforesaid bleeding screw, spilling EVERYWHERE and making a green/blue mess..... before u know that ur bimmer is sufficiently hydrated!!!.. i say someone had a pint too many when they designed this!!..
still..i hope our rantings about the radiator helps our friend to solve his prob..
cheers!