Quote:
Originally Posted by M.B.DOC
Proving the DUO valve bad is a SIMPLE task that takes less that 5 minutes.
Simply block off the heater supply line with needle nose pliers.. I have special hose type pliers that won't damage the hose. If you have a piece of rubber you can use it between the pliers & the heater hose.
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I didn't see this post while I was researching the links for my post above. This would definitely tell you if the duovalve was the problem or not and best of all it is free.
Jim
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Own:
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
Owned:
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)
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