Hello, I have a question on an issue that is driving me crazy. On my 300SD the flow through of air is excellent, i.e. fan runs, air moves to slot at rear window, and is felt leaving the car in vents on each side of trunk. The windows never fog up and air is never stale inside. On my 1985 300TD it always seems stuffy and now, in winter, the rear windows are always fogged. I have searched the forum with every combination of words on this topic I can think of and find no mention of any passive air flow system.
The rear pillars on the wagon have a vertical series of holes on the outer sheet metal which is covered by the trim spoiler. Same on 240d. Are these holes vents? There seems to be some type of fibrous material in these holes. Filters? Besides the fibrous stuff there is water dirt and now ice.
Does anyone know if there is designed into the 123 chassis a passive air flow system, and if so, some way to maintain it?

Thanks so much
Doug

I've never heard anything about it (though honestly that doesn't mean much ;-).

There ARE some vents in the rear of the 300TD - in the floor inside the spare tire area and also on the opposite side in the first aid kit area... however I think their purpose is to drain water, not air. But who knows, maybe both.

I hope someone more knowledgeable will reply, I'm interested in this too...

__________________
'81 300TD Wagon 355k (Miss Diesel)
'83 300SD 180k
'84 500SEL 190k (Parting it out)