From looking at my sunroof it seems to be seizing because of rust and debris. I tried a new motor and it did not seem to help. I think I will need to pull the sunroof and refurbish it and add a new gasket. Rust seems to be a big issue with these sunroofs.

Spence
1985 Mitsubishi PU 2.3 Turbo Diesel, 13" lift, Watercooled turbo, 4D56 Head, Atlas II,Fox Coilovers, Elockers,

1983 Mitsubishi PU 2.5 Turbo Diesel 4x4, fully restored

2003 G500, sliders, beadlocks, roofrack, ladder etc.