PeachParts Mercedes-Benz Forum - View Single Post - LOGIC REQUIRED -Engine Temp What Is Normal??????

Ali Al-Chalabi · #2 02-14-2002, 06:14 PM

Over 100C is normal in hot climates. The temp on MB thermostats is the temp at which they start to open. A lot of the time, as thermostat gets old, it starts to open at a lower temp.

If your temp is holding steady at 80C, you need to replace the thermostat. I replaced mine when I changed the coolant, and now it is back in the upper 80s to 100 range. Before I replaced it, the temp was running 82C on the highway.

Think about it, if MB thought that running 100C was not normal, then why did they design it so that a properly functioning thermostat should still be restricting coolant flow into the radiator at 100C? The fan clutch doesn't even start to pull mass air through the radiator until 95C.