The water temp sensor is located at the driver's side of the engine near the glow plugs. I haven't a clue what the one near the thermostat is for (some say for the aux. fan to come on at certain temps, but grounding it doesn't start the aux. fan on my car and it doesn't show up in the wiring diagram!).
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'81 300TD Wagon 355k (Miss Diesel)
'83 300SD 180k
'84 500SEL 190k (Parting it out)
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