Testing a thermal radiator fan switch

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sidetrack

Grumpy Mutt
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Ok science was never my strong point but water boils at 100 degrees Celsius right, I bought a switch that is rated 90/95. If I put it in boiling water and put my meter on continuity I do not get contact / beep ? Wanted to test before I put it into the radiator. My old switch did not activate either, it only gave a reading on the multimeter but enough to make contact. The fan works when I short the wires ?
 

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