What is the vacuum control valve called that is under the dash by the glove box? It is in a 1984 190D 2.2, I have two vacuum lines that are not holding vacuum. The two lines are #9, the green and blue stripe line, #10 the green and yellow stripe line. Does anyone know what these 2 lines go to?

Looks like Fastlane calls them vacumm elements.
http://catalog.peachparts.com/ShopByVehicle.epc?q=&yearid=1984@@1984&makeid=63@@MERCEDES+BENZ@@X&modelid=6119%3AED|10000092%3AMBC|1481@@190D&mode=SS&yearid=1984@@1984&makeid=63@@MERCEDES+BENZ@@X&modelid=6119%3AED|10000092%3AMBC|1481@@190D

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That valve controls the various pods that open and close doors in the climate control system to make air go various places. Lines that won't hold a vacuum mean that the pod has a leaky or broken diaphragm. Some can be rebuilt, others have to be replaced. Some are easy to get at, others require pulling the dash, a PITA. I do not have any technical information on 201 cars so I can't tell you specifically what pods are controlled by those two lines. My 124 is similar (and based upon many things first introduced in your 201) but different.

Jeremy

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"Buster" in the '95

Our all-Diesel family
1996 E300D (W210) . .338,000 miles Wife's car
2005 E320 CDI . . 113,000 miles My car
Santa Rosa population 176,762 (2022)
Total. . . . . . . . . . . . 627,762
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970

Would those 2 leaking lines cause my tranny to shift hard?

Possibly. Try removing the two leaking hoses from the valve and capping the two outlets. Use duct tape if you have nothing else -- anything to shut off the flow of air that's killing your vacuum.

__________________

"Buster" in the '95

Our all-Diesel family
1996 E300D (W210) . .338,000 miles Wife's car
2005 E320 CDI . . 113,000 miles My car
Santa Rosa population 176,762 (2022)
Total. . . . . . . . . . . . 627,762
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970

I will try that tomorrow, that vacuum element is a pain in the a$$ to get to.

The ACC supply line should have a check valve by the firewall so a leak doesn't mess with other consumers.

Sixto
87 300D

So you are saying that even if I have a leak in those 2 lines it should not effect the way my tranny is shifting?

That's how it is designed but, of course, it may not be operating correctly.

You need a mity-vac (or the cheaper Harbor Freight knock-off), the vacuum diagram for your car, to read a few threads and ask a few questions.

We've ALL had to do the same thing.

Follow the lines to the engine vacuum pump distribution tree. Cap the lines that don't go the VCV. If the transmission shifts better, there are significant leaks elsewhere.

Sixto
87 300D

I have a mity vac, thats how I found the leeks.

Good.

Vacuum diagram?

no vacuum diagram.

http://www.stinkbusters.net/vacuum.pdf
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The 601 engine isn't included.