'88 300E Vacuum diagram?

[Scoot12]

Hi everyone,

I am having trouble with the climate control on my 300E. It seems that the defrost will not close or not close all the way.

I understand there are a few vacuum units out there that make this function work. I am unsure of the part I need and how to locate them on the car.

Does anyone have a diagram or has someone fixed this problem before and may lend me thier assistance?

Thank you all for any response.