Yellow ENGINE / MOTOR Vac connectors (Please)

[TROVERMAN]

In the continuance of problems with the climate control system of my 95 e320, I have come upon 2 relatively small yellow vaccuum valves which say engine-motor on them and they split vacuum to other lines. They are located right near the master cylinder / fusebox area in the little space right behind the wall that separates the engine from where the fusebox is located. Closer to the climate outside air intakes and the monowiper. Mounted right on top, bright yellow, easy to see. They cost 8.75 from MB but they could not tell me what they go to.

Any ideas as to what they are used for? One of mine is totally broken, and I think it just happened recently.