Both vacuum actuators are up by the air filter. Should be obvious which one works what. The vac supply is the two branches on the passerger side of the 5-way "T" at the front of the engine.

From the actuators (really switchover valves, sort of) there is a vac line to the EGR and recirc valve. On our turbos, it is in front, very obvious. Dont' know were it is on the others.

On the W126 you can get to the vacuum actuators without removing the air cleaner. On the W124 it has to come out.

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!