All,

My 1985 300D KaliKar has always run "too low" on the temperature gauge since I got it back in August. The highest it ever read was just below the mark between 40° and 80° (is that 60° C?)

So I got a new thermostat, noticed it had 80° stamped on it. Pulled the thermostat housing; out popped and nearly brand-new thermostat marked 80°. Was oriented correctly. So I went ahead and installed the new thermostat. Put everything back together and refilled the system.

Drove for two days with the same result; gauge never gets above what I interpret as 55° C. Heater gets plenty hot; I also recently replaced the monovalue plunger.

So what do I investigate next? I'd rather not spend a lot more $$s on this if I don't have to. Engine runs well on the highway. Low speed/idle is still problematic--rough idle when cold (starts immediately when cold). Thanks for any advice.

__________________
Mike Frederick
1986 300SDL, 240K+ miles
1985 300D KaliKar, 270K+ miles