I have one of the fan switches that kicks the fan on lower
than the stock switch is factory spec'd for. It was what I
had on the shelf at the time when installing a new radiator.
When I do a coolant flush this fall I plan to swap it for a stock
switch. I don't like the fact it kicks the fan much more
than an oem spec switch. I really believe if your system is
working properly it is not needed and only a band aid if it's
not.

Bill -whose fan runs more than needed...