Trying to get at mine to asses what parts are needed. It is most likely a regulator assembly. I want to investigate, just to be sure.

Fought with the door panel for 20-30 minutes, ran out of time. Good to hear I am not the only one that finds this far more challenging than it should be.

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85 300D 3 pedal. Current project.
83 300TD (need rear wiper assembly dead or alive)
84 300SD Daily driver
85 300TD almost 400k miles and driven daily.
98 E300D *sold
86 300SDL *sold and made flawless 10 hour journey to new home.

Wow, this has been a while ago but I remember what a challenge it was! Best of luck and take your time.

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1960 MB 190Db w/ full sunroof
1985 Toyota Pickup
2006 Honda Odyssey EXL R&N
2001 VW Jetta GLS TDI