The amount of airswitches on your engine, as far as I can tell, depends on the year it was produced, ie emission standards. And the model car. The 1983 240D has 2 airswitches. One for EGR the other for tranny downshift. My 1982 has 3. What each one is for, I have not figured out, because it runs fine. I know I have a EGR system so that is 1. but I have a bowden cable so the other ones are not for downshift.

This discussion has to be geared for either 240D with the 616 engine and the 722.1 tranny. Or the 300 turbo diesel with the 617 engine and the 722.2 tranny. Then we have the 300 nonturbo to discuss.

Dave

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1970 220D, owned 1980-1990
1980 240D, owned 1990-1992
1982 300TD, owned 1992-1993
1986 300SDL, owned 1993-2004
1999 E300, owned 1999-2003
1982 300TD, 213,880mi, owned since Nov 18, 1991- Aug 4, 2010 SOLD
1988 560SL, 100,000mi, owned since 1995
1965 Mustang Fastback Mileage Unknown(My sons)
1983 240D, 176,000mi (My daughers) owned since 2004
2007 Honda Accord EX-L I4 auto, the new daily driver
1985 300D 264,000mi Son's new daily driver.(sold)
2008 Hyundai Tiberon. Daughters new car