You just put a socket on that red nut and turn it to open/close the sunroof, provided that your cable isn't stripped there at the motor, then the motor will just spin its gear.

You could always remove the cover on the bottom of the sunroof and just close it manually. Make sure you slide that bar forward to lock it closed. Don't ask how I know.

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1963 Ford F100 - Cummins Swap?
1985 Mercedes 300SD - 210K
1992 Ford Festiva - 92K
2001 Ninja 250 - 8K