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Old March 28th, 2022, 08:08 PM   #52
DannoXYZ
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Name: AKA JacRyann
Location: Mesa, AZ
Join Date: Dec 2011

Motorcycle(s): CB125T CBR250R-MC19 CBR250RR-MC22 NSR350R-MC21 VF500F CBR600RR SFV650 VFR750F R1M ST1300PA Valkyrie-F6C

Posts: A lot.
MOTY - 2018, MOTM - Nov '17
Actually test thermoswitch to make sure it turns ON when hot. The sensor that drive gauge doesn't have anything to do with fan.

1. measure resistance/continuity across switch at room temperature
2. put thermoswitch into pot of water, and bring to boil
3. very 20-degrees increase or so, check resistance/continuity of switch
4. at what temperature does switch close?
5. or does it never close?

There's your answer.

Another way I've monitored this is to attach idiot-light on dash connected to fan. When switch closes to turn on fan, it also lights up bulb.
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