Steve MacSween wrote:
My coolant temp sensor (the one in the T-stat housing) isn't current hooked
to anything, and there isn't an obvious orphan wire under the hood.

Where should I be wiring it up to?

Also, just to confirm, that IS the sensor that controls the auxiliary
electric fan, correct?

As I recall, the 300SD didn't get aux fan operation with engine temp until 1985. Before that the aux fan ONLY operated when the AC refrigerant circuit triggered it.

Marshall
--
          Marshall Booth (who doesn't respond to unsigned questions)
      "der Dieseling Doktor" [EMAIL PROTECTED]
'87 300TD 182Kmi, '85 190D 2.0 161Kmi, '87 190D 2.5 turbo 237kmi, '84 190D 2.2 229Kmi (retired)

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