In the trunk by the driver side trunk hinge is the sun roof motor. Should be a socket type tool there in a little saddle just in front of the motor. You insert that socket tool into the motor and rotate it with a reversable ratchet to either open the roof or to fully close it. Once open it most likely needs the rails cleaned and re lubed or the cable is stretched? If not there then a wreck should have it. Most dont even know what that tool does!!

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81 300CD (sold) 1972 280 SEL 4.5 (sold) 1966 250 S 4 spd (sold) 1974 450 SL (sold) 86 BMW 325ES (sold), 1973 280C (sold) 1988 300 SE.