This evening, on the way home, I noticed that the engine temp never rose above 60 degrees C, well below its usual 90 degrees. It was, therefore, a rather chilly trip. I presume that the thermostat has stuck open, but I'm surprised that the engine never warmed up at all, rather than warming rather slowly. Could there be any other explanation, or is this normal behavior for a stuck thermostat on a 617?

Phil

'84 300D
'85 300D