Thread: Coolant

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Originally Posted by firebird77clone

Seems to me, before you could verify sending unit (by measuring resistance) you would first need to verify temperature. So the afore mentioned heat gun is a good start.

Once you know the actual operating temperature, you could then test resistance of the sending unit to know which is bad, the sender or the guage.

I put one in boiling water with ohm meter leads clamped to it. We know that temperature.