I've got a 1994 E420. Gonna start my project to change the evap core in a couple of days. I'm buying all the parts now. How many single chamber vacuum actuators and dual chamber actuators are there?

any picts or schematics?

Three dual chambers (2xrecirc, 1 defroster) plus three single chamber (footwell, center vent, I forget the name of last one - bypasses the heater core and feeds the center vents...).

All six are actually different parts. The three dual chamber elements have the same body, but all have different metal arms. I think all three single elements are different sizes/body shapes. It's been a few months since I laid eyes on them all.

- JimY