Black lines are vent lines -- one goes to the transmission control, don't know where the other one goes. They are routed to the passenger compartment to keep dust out. They don't connect to anything inside.

Peter

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1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!