In the past I've drained BMW rads using a bolt on the rad or by pulling the coolant level sensor on the lower part of the rad.
Here are the TIS instructions for draining and refilling.
The engine drain bolt tightening torque is 25Nm or 18 ft-lbs.
Straight lines are for fast cars...turns are for fast drivers
'04 M3 - track
'06 650i Cab - daily driver
'02 Highlander - kid hauler
'01 330Ci - winter beater
Last edited by Yorgi; 11-02-2011 at 10:50 AM.