If it's got AC and you're using the 'screen defrost' setting on the fan speed, the AC will cut in, putting the fan on.

No seperate fan switch, the fan is ECU controlled.

Only temp sensor is the 'CHT' sensor that's fitted in between two of the spark plugs.

It doesn't go into coolant, it has a sacrificial end that when fitted and torqued correctly makes contact with the metal head casting.