I agree with cleaning everything and taking a fresh look. I like to use a bright flashlight and trace the flow to the highest point from underneath if I can't see it from the top of the engine--just after shutting off the engine when the water temp is at normal operating temp. Usually the steam is very visible in the light which helps quite a bit. First place I would look is the shaft the fan is on where it goes into the waterpump on the engine.

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X5 4.6 2002 Black Sap, Black interior. 2013 X5M Melbourne Red, Bamboo interior
Dallas