tinypanzer,

coolant sensor replaced at 125,419 mi. (current mi. = 227,561) so I guess thats plenty of time for the sensors to go bad.

I would like to know how to check these. How many sensors are there, and where are they located, etc. What resistance should I be seeing across the poles?

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1991 300CE Sportline
1983 300SD TurboDiesel (Gone but not forgotten)