I have glanced through my owners manual, but cannot find anything, nor see any buttons. So, does the 85' and older S-Class models lack the "recirculated" air feature? If so, I find this very strange, because this was a feature on Japanese cars as far back as the 1970s.

I have had several pre-85' Japanese cars and all had "recirculated" air feature- my old 81' Toyota Cressida and 84' Honda Accord had it and even grandpas old 1984 Toyota Van and 1983 Toyota truck had it. They had a lever that you could slide for "FRESH" air, or "RECIRCULATED" air. My 84' Accord, as well as my 86' Accords actually had a button for this that was electronically controlled.

Perhaps I am just not sure which button it is on my car? If they do not have it, what year did they add it on the S-Class and wonder why is was void on these models?