Thanks, I will try by-passing the switch on the drier tomorrow afternoon and let you know. I found the "KLIMA" relay this afternoon and pulled it out to check the pins for corrosion and general condition. There was a little green stuff on it, so I cleaned it off and cleaned the receptacle with a spray cleaner and a little wire brush. No net effect. I there a way to check the function of the relay with a multi-meter? Thanks.
1986 Euro 190E 2.3-16 (291,000 miles),
1998 E300D TurboDiesel, 231,000 miles -purchased with 45,000,
1988 300E 5-speed 252,000 miles,
1983 240D 4-speed, purchased w/136,000, now with 222,000 miles.
2009 ML320CDI Bluetec, 89,000 miles
1971 220D (250,000 miles plus, sold to father-in-law),
1975 240D (245,000 miles - died of body rot),
1991 350SD (176,560 miles, weakest Benz I have owned),
1999 C230 Sport (45,400 miles),
1982 240D (321,000 miles, put to sleep)