Isn't that the supply hose for the cabin air temp sensor? If so, it looks like you're missing the foam piece that connects it and the sensor on the dash. I just used some foam pipe insulation to replace the original foam on my car because it was crumbing.

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Seth

1984 300D 225K
1985 300D Donor body
1985 300D Turbo 165K. Totaled. Donor Engine. It runs!!!
1980 300SD 311K My New Baby.
1979 BMW 633csi 62K+++? Dead odo