Instructions For Disassembly/Assembly Of Coolant Hose Fast-Release Couplings
WARNING: This page is about a different car, the 2007 BMW 550i and 2006 BMW 550i. However, it is still accessible from the selected car via links, so may be relevant.
Disassembly of fast-release coupling
Withdraw lock (1/2), disconnect hose.
Installation:
Check O-rings (1).
Do not coat O-rings (1) with antiseize agent.
Assembly of fast-release coupling
Press in lock (1) before installing fast-release coupling.
Push on hose.
Fast-release coupling must clearly snap audibly into place.