Actually you should pull the sensor and use a pot of water on the stove with a tiny bit of coolant or salt (to increase the boiling point) and test through the full range. NTC and PTC based sensors can shift over time and may appear fine at one temp but get further off very quickly as the temp changes. Use a GOOD thermometer to monitor the water temp.
The same thing goes for measuring rheostats (TPS and the VAFM on the GE)... should be a smooth transition, this is easiest to measure with voltage supplied though and not by the OHM readings. Well, same thing as in shifted values, not boiling them in water.
