Stack water temp sensor problem

[Mcalvert]

With the engine back in the car having changed the clutch and CRB, I have one remaining problem.  The water temperature reading on the stack is an off-the-scale "999".  My initial thought was that I must have broken a wire somewhere or not disturbed a connection, but disconnecting the sensor drops the reading to 0, so maybe not?

I can't think of any reason why the sensor would have chosen to go faulty while the engine is out, but assuming these work on resistance, does anyone know what their normal operating range should be?  I put my multimeter across with the engine hot and it read just 0.3 Ohm.  Thoughts appreciated!

 

[Jonathan Kay]

Can you tell us the part number of the sensor?

How many terminals on the sensor?

How many wires go to the sensor, and what colour are they?

Do you have a wiring diagram?

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You've already done the test of a forced open circuit. There's one other quick check you can do: disconnect that wire at the sensor end and short it to earth. What does the display now show?

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Edited. Just found a manual for a Stack 8130. Let me know if you'd like it. It identifies their sensors, and includes:

Jonathan