If you open the console the rear compartment of the two will pull out. Once you have pulled it out look at the rear toward the vent you will see a vertical piece that is almost as wide as the compartment. That piece can be out of place if someone has been working in that area. I have not seen it get out of place on it's own but it is easy to check. The piece also just pulls out. It connects to the incoming air and links to the rear air duct inlet.

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