Do you know what the amperage output is of the alternator on satoh s650g? I want to say around 35 amps but could be wrong. I just know at this point I'm low on options, I just had a fan break apart and take out my new rad, so had a recore done for 880$.....Just make sure your alternator can handle the load
I would set the turn on temperature a bit over the thermostat temperature, then full speed 10-20°s above that.