I removed the vertical console plate to get at my radio easily and found one of the A/C vacuum lines was disconnected. There are 2 lines running to the recirculation (upper) switch which has 3 connections labelled A, B & C. The one still connected is attached to "C". Which one does the other line go to, "A" or "B"? I lean towards "A".

On another note, when the A/C switch/control module goes bad, is it fixable? Is there a particular component that goes south? I'm not afraid of electro-mechanical devices and know how to wield a soldering iron.

Thanks in advance...

Oh yeah, it's a 560SL, fat-fingered the 9.

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1999 E320 (gave to daughter) 250K
1994 F150 (may be the end of its road) 240K
1989 560 SL (Reassembly after paint job) 160K
1986 560 SL (deceased., gave it's life protecting my wife)
1988 300 TE (departed)
1994 945T (still running strong with an upgraded cam) 349K
1986 242Ti (deceased)
1968 GT500KR (under restoration)

Maybe this will help.

Attached Thumbnails

 

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RM Smith
1988 560SL

"Where is it again that we are going, and why are we in this handbasket"?

As the photo Walrus shows, hook it up to "B". Look at the following site for self repair on the push button control box:

http://207.210.95.34/~boostd/Climate/

Good luck!