Thread: Coolant

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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.

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.