first thing to replace is the vacuum distributor block in lower left of your picture.it is cheap and you can use a small open ended wrench to pop off the connections without damage.[common prob with these cars].

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David S Poole
European Performance
Dallas, TX
4696880422

"Fortune favors the prepared mind"
1987 Mercedes Benz 420SEL
1988 Mercedes Benz 300TE (With new evaporator)
2000 Mercedes Benz C280
http://www.w108.org/gallery/albums/A...1159.thumb.jpg