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The plastic line that plugs into the rubber 90 degree fitting is a vent line. It goes through the firewall into the passenger compartment and terminates under the dash. The factory figured that the air was cleaner there.
I was told that the 90 degree fitting is NLA but that I could get a straight fitting, which I did. I cannot find the part number but you can get it from EPC (now free) or your dealer.
Running the motor with that part completely missing will do no short-term damage.
Jeremy
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"Buster" in the '95
Our all-Diesel family
1996 E300D (W210) . .338,000 miles Wife's car
2005 E320 CDI . . 113,000 miles My car
Santa Rosa population 176,762 (2022)
Total. . . . . . . . . . . . 627,762
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970
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