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Old 06-09-2002, 08:04 PM
JimSmith JimSmith is offline
Join Date: Jul 2001
Location: Old Lyme, Connecticut
Posts: 3,596

If you take the thermostat out, the by pass line letting fluid from the engine bypass the radiator, will be open all the way and you will have no control over engine temperature. The pump will draw fluid from the path of least resistance, and in this cas it will likely be mostly from the bypass path as the radiator introduces some extra resistance. The manual very specifically states removing the thermostat will not correct an overheating situation. If the temp stays the same though, it might let you know the thermostat is not doing anything. Jim
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)
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