MOST sunroof problems on that W210 chassis are related to the plastic cable guides. THEY weren't designed to take the load that the cables apply & the cables jump out. MB now supplies a reinforced guide with 2 retaining screws instead of the 1 that they came with. Takes about 1.5-2 hrs to replace them.

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MERCEDES Benz Master Guild Technician (6 TIMES)
ASE Master Technician
Mercedes Benz Star Technician (2 times)
44 years foreign automotive repair
27 Years M.B. Shop foreman (dealer)
MB technical information Specialist (15 years)
190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)
Retired Moderator