Are you talking about #3 in this link?

RealOEM.com BMW E53 X5 4.4i Cooling System Water Hoses

If the retaining spring clip is in place you can try pushing up with a large screwdriver or something similar from underneath until you hear the *click* of solid engagement of the clip.

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X5 pics

RIP 4.6is.....

2003 4.6is