Dear listers,
Could you please share the knowledge pertaining the MB 124 sunroof intended design. Is is supposed to a) stay airtight since new for a long time then leak some, while draining tubes take care of the drainage; b) stay airtight all the time, draining tubes providing "flood insurance"; c) stay airtight for does not matter how long since draining tubes are an integral part of the sunroof system and should drain all the drainage. The reason i even ask is that I have my sunroof pretty tight IMHO and it still leaks quite a bit during/after the carwashes. Knowing the MB intended design should help with the repairs.
Thank you,
Corneliu

There are four drain hoses from the pan, the gasket would have to be awful sloppy to allow that much water to penetrate. Knowing that car washes put down a lot of water, sometime with air pressure, check the drains, replace the gasket $100!

I don't think the sunroof seal was intended to be completely airtight, since the roof has to move through the seal in both directions. Still, it shouldn't let more than some minor seeping go through the seal if the roof is properly adjusted. I've been driving with the headliner off for the last year or so, and I've never seen actual liquid come through the seal, even in heavy rain.