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Discussion Starter · #1 ·
OK, what's the deal with frameless doors? Mercedes is making this a sales point in their sales brochure. Why? What am I missing? Are they just looking for extra filler in their brochure? I don't get it.

I would imagine a framed door (where the window is entirely encased in a metal frame on the door) is stronger and better for weather proofness. I think it would form a tighter seal and seal the window glass better than a framless design.

Maybe I'm over thinking this. Does Mercedes usually put these frameless designs in their cars? I know lots of American cars in the 60's and 70's had framless designs, but that's a car era I wouldn't exactly look towards for quality/design cues. Any thoughts?
 

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Discussion Starter · #16 ·
The more I think about it, the whole 10 mm lowering of iced-up windows does concern me a little bit. I have a nice warm garage at home but my car will see horrific ice and all kinds of frozen rain while it sits in my workplace parking lot.

I'm an engineer myself and I would hope MB engineers thought this scenario through when designing their design. I actually have had my Audi windows freeze up (and that was after I scrapped away all the exterior ice). I would hope the Mercedes' motor doesn't get damaged when the windows are frozen. And I would hope the door opens and closes properly when the windows are frozen.

However I think one of the main reasons for the 10 mm movement is because the pressure is so tight inside the cabin it's meant as a pressure release, so that the door can close. I once had a VW New Beetle that was so tightly sealed, I could not close the truck no matter how much force I used. I would try slamming it 50 times and it wouldn't latch. It's wasn't fun. If I left one window slightly open, then it latched OK. I think BMW currently uses a similar 10 mm drop method due to their tight pressure. However BMW doesn't have frameless doors (at least I don't think so).
 

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Discussion Starter · #18 · (Edited)
Perhaps I should have been clearer. The frameless design by itself doesn't interest me. It's the combination of BOTH frameless and the 10 mm motorized drop that intrigues me.

Granted there are a lot of cars out there that are frameless. And granted there are other cars out there that have the 10 mm motorized drop. But other than BMW convertibles I can't think of many cars that have BOTH a frameless design and a 10mm motorized drop.

Now I'm not an expert on every car in the world and it's probably really nothing to worry about. But I enjoy examining technical things inside and out and understanding how they work. I'd like to ask the MB engineers how they can design a 10 mm motorized drop knowing that in some instances it won't happen when the windows freeze up. So then I gotta wonder how critical is that 10 mm drop really. And it makes me hope the motor has an over-ride clutch in it, because otherwise it could get damaged after repeated opening and closing of the door with frozen windows. Here's a thought, maybe the MB engineers designed the 10 mm drop to disable itself if the outside temp gets below 32 degrees. I'm just thinking out loud here.
 
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