this is a modified Quote from X5_Rob
"open the sunshade all the way and vent the 2 sheets of glass.. Then climb in the back seat and look at the middle of the 2nd smaller (rear) panel on either side (driver and passenger sides of the car).. You will see a single torx screw on each side.. Unscrew both of those screws .. Those screws hold the panel guide in the open or vented position. Now get out of the car and give the panel a firm push downward.. It will close down.. That's it.. The entire sunroof should now be fully functional minus the ability for the 2nd panel to vent back open"

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I swear, my cars are like a girlfriend.
Sometimes its a rough ride, sometimes its smooth motorin'.
Sometimes she doesnt like how i treat her and sometimes i dont like how she behaves.
BUT at the end of the day, she loves it when I am inside her.

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'91 850i
'05 X5 4.4i
'09 Clubman S