I'm not sure this is really a problem. I avoid using my sunroof when it's cold out, since the few times I've tried it moves VERY slowly, if at all, when the ambient temp is cold. W124 sunrooves are NOT fun or easy to fix if you break off the plastic parts which operate the tilt feature.

If you haven't already done so, clean the metal channels on the sides and use the 'official' MB sunroof grease; then leave the sunroof alone until spring.

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Steve
'93 400E