July 1: So it begins. Don't worry, this is not in the correct legal jurisdiction!
Assembly Of Fast-Release Coupling
WARNING: This page is about a different car, the 2005 BMW 645Ci and 2004 BMW 645Ci. However, it is still accessible from the selected car via links, so may be relevant.
Press in lock (1) before installing fast-release coupling.
Push on hose.
Fast-release coupling must audibly snap into place.