I was able to acquire these two Duovalve how-to's: 1) Courtesy of Jim F. http://v12uberalles.com/Rear_AC_System.htm 2) and this excellent HVAC thread at Benzworld at which MSF's MattL provides many excellent HVAC tips: http://www.benzworld.org/forums/w210-e-class/1265436-ac-quits-blowing-cold-air.html which was sent to me courtesy of xvvvz who posts here and there as well. I will take pics of my progress to have some W202 specific DV DIY. Hopefully, it works out. Michael

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Michael
Southern California/Santa Monica
1986 MB 190D 2.5, 5 Speed Black and Palomino "Mordechai"
1985 Porsche 928S (32V), 5 Speed
1980 Porsche 928 (16V), 5 Speed