Out of curiosity, I vented mine. First, I slid the headliner back. Vent second. I pulled the switch button back. It closed the vents first. The pano went wide open. I drove around Austin with the roof open. One quick switch forward push closed it all.

With the vent open, blow compressed air into the rails. Lube it with a spray can straw. As long a part is not broken, it may come loose. Dirt is not our friend. I lubed the rails on my X5 last week.

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'06 X5 3.0i - bought @143,123 miles (12/26/20)