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If it was the relay the fan wouldn't come on when you disconnect the coolant sensor.
I would get a OBD2 scanner on the car and see what reading the ECU is seeing for coolant temp, I bet it isn't the same as the dash gauge.
If it is faulty not only will the fan not trigger correctly, the ECU will be running an open cycle loop using more fuel.
When you change it you shouldn't lose much coolant if you work quick.
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