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I just got my new (to me) 930 delivered today and noticed that there is a zipper in the headliner that runs across the width of the car about 2" in front of the top of the rear window. What is this zipper for? (I can hardly wait to hear these answers. )
If for some reason you can't close the sunroof with the electric motor it's for opening the headliner to access the sunroof mechanism and move manually with a crank handle which should have come with the car.
Check your glove box to see if the handle is in there.
Be very careful in unzipping that zipper as if the headliner is old as it will be fragile, the tongs of the zipper can be contaminated over time which will easily result in tearing of the headliner. Always apply pressure with one hand at the closed end of the zipper while slowly sliding the zipper open.
The same applies for closing. Apply pressure the zipper sides to relax the tension on the headliner fabric as you slowly close the zipper..