Hello Gents! Ok I have 1993 300D 2.5 W124. I am on Day 3 of replacing the evaporator. I seem to find myself stuck on a point. I already pulled the box and installed the evap, I can't figure out where the thin black tube that comes from the firewall (behind the steering wheel, located by the expansion valve), next to the yellow and blue?orRed? vacuum elements. Does anyone have any pics or can help me out?

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