thermoswitch doesnt require a controller, it is installed in the coolant stream much like the OE S13 AC fan thermoswitch, and is designed to close circuit at a precise temperature. the AC thermoswitch would turn on at 200 i believe, a bit high but it can work.
there are other degree thermoswitches out there which can be used to activate your e-fan relay triggers, as opposed to using a ghetto ass switch.
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