Thermoswitches are notoriously unreliable.
The aftermarket stuff is pure junk.
A lot of the aftermarket electric fans that use those electric controllers with the push-in temperature probe (into the radiator fins) fail consistently.
The stock units are a lot better, but I still won't trust it.
I was running off the stock FC thermoswitch for years, but even that failed after a few years of use.
I was running the Spal PWM controller until I accidently short circuited the thing.
Now I run my fan off the Haltech E8.
-Ted
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