64 11 207 Replacing heater core (heating)
WARNING: This page is about a different car, the 2003 BMW 525i, 2002 BMW 525i, and 2001 BMW 525i. However, it is still accessible from the selected car via links, so may be relevant.
This task is described in "Replacing heater core (automatic A/C)", refer to 64 11 208 REPLACING HEATER CORE (AUTOMATIC A/C) .