The thermostat on my 1985 300D turbo stuck open and the temp sat at about 50. I replace the thermostat and for 250 miles of highway driving it stuck right at 95. Toward the end of that trip (the last 20 miles or so) it moved up to 105. Why would an engine that runs stone cold without a thermostat not hit the pre set temperature and stay there? The air conditioning compressor is disconnected. Has to be the new thermostat? How much trouble do you have with new thermostats? Do I have to much time on my hands? My father used to call it motor worry. You are driving home late at night and the whole family is asleep and by the time you get there you have a rod knock, bad universal joints, and four bad wheel bearings, but it's all better in the morning.

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Dan Stadt
'85 300D turbo
'79 300SD
'73 220D