< I just hate the temperatures it was designed for!
>

That is why I asked for year and model.
There was another switch on some models that came factory with a lower temp cut-in that just threads into your sensors hole
So , when you give me that . I can look it up for you..

PS .. don't confuse the dual fans of the 124 and 201 chassis with the S class fan set up.
These have 2 speeds , but they are independent of each other .. The low fan is a/c pressure activated and the high fan is coolant temp activated . Two completly different circuits that share the same fan motors .
The resistor bridging of the coolant sensor on these models only effects the cut-in of the high fan circuit and will never trigger a low fan.. that is only triggered when the a/c is on and the high side pressures call for fan via high side pressure sw.