My drivers side front window did the same thing. It's my new to me 1978 300D. Well, about the third or fourth time I heard a pop/clank and now the window moves up and down by hand only. I hear the motor but no effect on the window. Search suggests the regulator has died. I'm hoping the track has separated from the window and i can just glue it back. Looking forward to more experienced opinions on this.


Kevin
1979 240D manual
1978 300D manual