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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I'm sorry, but I do not understand what you are asking here....

Jim

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14 E250 BlueTEC black. 45k miles
95 E320 Cabriolet Emerald green 66k miles
94 E320 Cabriolet Emerald green 152k miles
85 300TD 4 spd man, euro bumpers and lights, 15" Pentas dark blue 274k miles

Basically, I connected all the vacuum elements and there seems to be a thin black tube that protrudes through the same hole that the yellow and red vacuum tubes are located. This hole comes through the firewall just above the expansion valve, and comes into the compartment behind the instrument cluster and ignition. I can't figure out where it connects?

I replace mine a couple of weeks ago but did not take any pictures. If you can point out in your pictures exactly what part you are talking about then we might be able to help. Do you already have the dash back in or was the second picture taken before the dash was removed.

It's possible that line connects to nothing-it's a vacuum vent stuck into an area of cleaner air.

Hey Guys, Thanks for the feedback. I went ahead and took the advice Chas H. It seemed the most likely one considering I checked everywhere around that vicinity and nothing seems to match. Today, I finally should have everything back and see if it all works. This is my first mechanical job and I definitely can say it is a tough fix.

Could anyone tell me, worst case scenario if something wasn't placed back correctly, and I started up the vehicle, would I be able to see or hear the problem?


In other words, if the car starts up and blows cold air without any leaks, does that mean all is well?