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The fans operate sequentially according to the following: schedule:
With the temperature increasing, the first fan is energized at 101°C / 213.8°F, the second fan in energized at 102°C / 215.6°F.
With the temperature falling, the second fan is de-energised at 101°C / 213.8°F and the first fan is de-energised at 100°C / 212°F
The sensors are proportional with the resistance varying according to the temperature.
The two sensors are identical, they can be swapped for diagnostic purposes
Temperature/Resistance relationship
At 100C it is 0.2kohms
At 110C it is 0.15kohms
a span of 0.05kohms over 10C
If you plan to test them, uses a pan of water that you can control the heat, you will need a thermometer.
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