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After checking with an infrared thermometer and obtaining indications of 62C on the head, I had the fan clutch and thermostat changed. The fan clutch was indeed engaging at too low a temperature (58C or so) although I can't imagine what type of internal failure would cause that. The thermostat was not doing its job either. The engine now runs rock steady at 83C.
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'96 C280 (gone)
'97 C36
'05 C230k
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