on my 93 940 wagon, the driver side cable that operates the open/close/vent system had broken where it connected to the slider that runs along the lefthand rail.
Found a pair of cables at Voluparts in Atlanta, the only place I could find that parts out 940 sunroofs, voluparts@gmail.com, 888-280-4057. Bill even had the nasty clips that hold the sunroof headliner panel in place.
After replacing the cables (had to drop the headliner, sunroof & pan), I took the motor out and installed a manual crank. The crank allows me to feel what is happening and not apply enough torque to do damage again (the cable originally broke when I leaned on the motor switch too much).
Warning - if you live in a hot climate, do NOT service the sunroof - you'll roast alive. Wait until winter ....
And take LOTS of photos as you dis-assemble the sunroof - I couldn't find much detailed info available online about how things go together.
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