What do these lines go to?
 

On my 1980 300D I have the old style vac pump with one hose going to the air cleaner. The other one goes to the brake booster with 2 nipples before it one going to the top of the valve cover and the other going to a four way which includes a 1. BROWN line which I THINK IS TO THE IGNITION and another to the 2.door lock check valve and the 3. to a GREEN line which I have no clue where it goes. My locks dont work, there are no leaks in any of the elements (I checked) . From nipple which goes to this four way it was showing about 20in of vac. When the four way was connected I checked from the end of the connecter that goes to the door lock check valve and would not show any vac. (by the way locks are not operating)so then I checked the BROWN line and pulled vac on it and it holded it. Then I checked the GREEN one and it would not hold. And to you know on the door lock check valve it has 2 outlets right one which has the cruise control hooked on and the other outlet with a three way one with the vac tank conneted (to the trunk) and the other the suction line. Is this supposed to be like this?

So when I rig it and take out the cruise control from the check valve and hook one outlet to the vac tank and the other outlet to the suction line and directly hook it up to the nipple on the hose coming from the vac poump the locks work.

Im realy not sure how these line are suposed to be arranged in order for everything to work. I need to know where the BROWN line goes to? and the GREEN line whick I cant get to hold Vac.

Anything would help me out THANKS:behead:

The green line goes to the vac of the climate control system. Behind ccu unit in dash.
The brown line goes to ignition switch, and from switch to back of IP.
Yellow to door lock, yellow with gray stripe to vac res. in back. On many I've seen, the yellow and yellow/gray come from the check valve.

Yellow should be door locks, green should be climate control, and brown is engine shut-off.

Is the GREEN line supposed to hold vac if pulled on with a tester?

And the the vac tank line and the yellow suction line is connected with a "T" and is going to only one outlet of the door lock check valve. The other outlet is connected to the cruise control line. Is it supposed to be like this?

The green line should hold a vac. Sounds like you prolly have a rubber diaphram or two that are ripped.......
It takes up to a hundred or more pumps with the mightyvac to pump up the line to the vac tank in back.....

Try changing the climate control to different settings and re-test the green line for each button setting.

Which diapharm? I tested the tank it holds vac. Im not sure the setup of the lines are right. Do you hav a diagram of of one this model? A/c doesnt work only until i pree th defrost switch but it doesnt cool anyways.

There are many different minor variations of our vac systems. Best bet is do a search here, and look at several of the examples. Then compare it to your components and route accordingly. It isn't too difficult once you sit down to do it. The difficulty comes when you realize the dash needs to come out to get to the vac pods.
Sounds like you have all the issues: vac leak, ccu issues, AC problems......
At least cooler weather is on the way.....
:D

a good source of info that I remember was http://tech-meister.com/DieselBenz tons of information to get you started including vac diagrams.

edit: the site appears to be down at the moment or having problems. check back on it later