I'm not getting air out of my dash vents. The pods hold vacuum when I connect a vacuum pump to line 5 at the black box above the coolant pump in the engine compartment. The problem is that no vacuum is being sent to the compartment. Anyone have any ideas which line should be sending vacuumto the box or where to test from here?

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1980 300D 300K KM - parting out
1979 300D 375K KM - parting out
2 300Ds for sale