Speedyfix,
As Ezgrand has said, the thermoswitch is failsafe in that the circuitry is normally closed (n.c.) so that if it fails, it will lose ability to shut off the fan. I think all other cars are the same. If the fan is not constantly running, it should therefore mean that the thermoswitch is ok.
Ezgrand,
I think the main reason why the thermoswitch is separate from the thermostat is reliability. Both 'stat and 'switch are much more reliable being separate units than a universal thermostat/switch.


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