How does a radiator temperature switch work?
In layman's terms...the battery is supplying the radiator fan with power, continuously BUT the "thermo switch" keeps the circuit broken until the fan is needed.Basically the two or 3 wires running "into" the switch "do not" connect on the inside UNTIL the right temperature is achieved.
Then on the inside the of the switch, once heated, causes enough power to let a device inside, to move and allow the circuit to be completed.
This allows the "already on" power to make the fan come on.
If you want to test the switch....just take off the wires to it and touch them....if the fan comes on, then chances are it is the switch that is faulty.If the fan does not come on then....there is a problem in the wiring circuit.
Many things can lend to a default in wiring such as a broken fuse, bad relay or broken wiring connection.
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