Also, in the W201 the vents are in the trunk under the trunk latch area. They are just flaps that allow pressure out but will close if air tries to come from the outside in.

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'84 190D 2.2 5MT (Red/Palomino) Current car. Love it!
'85 190D 2.2 Auto *Cali* (Blue/Blue) *sold*
http://badges.fuelly.com/images/sig-us/302601.png
http://i959.photobucket.com/albums/a...0/sideview.png

""The other drawback on leaving it on recirculation is the possibility of mildew growing in the evaporator. Having fresh air would help dry the evap and prevent this issue."".. Delivery Valve

I do not think that the physics described there are true...
I do think you need some oxygen introduced into the car.. perhaps 10 percent open flap...... when the AC is on the humidity is being dropped out the drain tube......and when the heater is on... the ac is also on and it is doing the same thing in order to not have the window fog over...
The air coming into the car from outside is almost always more humid than what is being recirculated inside the car....

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1980 240d ,

chain elongation, cam marks reference:
http://www.peachparts.com/shopforum/diesel-discussion/10414-help-i-need-check-stretch.html

http://www.peachparts.com/shopforum/diesel-discussion/305365-9-degrees-chain-stretch.html

evap fin cleaning:

http://www.peachparts.com/shopforum/diesel-discussion/156207-photo-step-step-post-showing-w123-evaporator-removal-1983-240d-1982-300td.html?highlight=evaporator

A/C thread

http://www.peachparts.com/shopforum/diesel-discussion/297462-c-recommendations-mb-vehicles.html

^^^ good point...

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1983 123.133 California
- GreaseCar Veg System

3.20.20

THANK YOU ! .

I hope to eventually make this mod .

Those of us whom live in Desert climes are wise to make the modification .

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-Nate
1982 240D 408,XXX miles
Ignorance is the mother of suspicion and fear is the father

I did then what I knew how to do ~ now that I know better I do better