Originally Posted by jcyuhn

Try these two links:

Rerouting vacuum lines to have recirculated a/c at all times?

w123 recirculation "flap"

The text describing which of the 5 electric vacuum valves to select somehow got cut from the first post. But that information appears in the 2nd thread linked above. I deny any relationship with the guy that wrote the original article.



IIRC, the CCU decides whether to invoke recirc based on the temperature delta between the setpoint and the vehicle interior. On a 123 there is no way to force recirc, you are at the mercy of the climate control logic.