Somehow in the excitement of replacing pods, connectors, changeover valves, etc. during my ACC adventure, I lost track of where this line goes. It's red with blue stripe and approx. 28 inches long. There is already a red/blue line attached to the red/blue fitting on the changeover valve. Any ideas where this one goes? Thanks in advance. 83 300SD

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1983 300SD "Helga"

My pictures from my dash out on my w123 dont have great detail, but assuming your 126 is similar, and if memory serves, there should be a line between the defroster pod and center vent, with a Y fitting at the center vent. I would check there.