very good, that was an easy fix. the only hiccup was figuring out that my thermostat housing was original to the chassis, so i had to reuse the old O-ring instead of the brand new gasket with the stub protrusion. i took the opportunity to reroute another heater hose and spill coolant all over my alternator. happy day!

so, now it gets up to 90ish C much more quickly, and i am more happy too. i was incorrectly assuming that the thermostat opening temperature was much lower than it actually is (80 C). thanks folks!

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'77 240D, 504H, OM617.952, etc.