When you select warm or cold on the dash, the valve receives the signal and blends hot coolant or not to direct heat to the HVAC system. It is one of the common points between your two symptoms of the HVAC not responding to inputs, and your coolant loss.
This thread has some background info:
http://www.xoutpost.com/bmw-sav-foru...ht-thread.html
See realoem for a drawing of the control valve and hoses. It is part #4 in this diagram.
RealOEM.com * BMW E83 X3 3.0i water hoses/water valve
I haven't done one on an X3, so don't know exactly where it is mounted under the hood, but just follow the heater hoses.
Good luck.
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2007 X3 3.0si, 6 MT, Premium, White
Retired:
2008 535i, 6 MT, M Sport, Premium, Space Grey
2003 X5 3.0 Steptronic, Premium, Titanium Silver
2002 325xi 5 MT, Steel Grey
2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue
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