Reply to "Proper location for fan control thermostat"

My Ramblings and Opinions….

The cooling control scheme for all the equipment I worked was to try to set the radiator (heat exchanger) outlet to a design temperature and let the engine outlet indicate how much load was applied.

The original Pantera locations were in the radiator outlet, and fans were set for ~160F and ~180F. thus when the radiator outlet was greater than~160F cut on first fan, and if not enough as indicated by radiator outlet getting greater than ~180F cut on second fan. When the end tank was changed from vertical divide to horizontal is when the switches got put on the wrong (inlet) side.

Thus I would lean towards fans controlled by radiator outlet with the 165F on switch.
1)thermostat controls the engine's coolant outlet
2)fans assist the radator's coolant outlet
3)coolant in to the motor needs to be cooler than thermostat

How hard would it be to swap the under car tubes so that inlet goes to the top? With the radiator outlet out the top has the location where air would accumulate locations the same as the water pumps suction (increases chance of pump cavitation). By having lower radiator supplying the pump provides the most positive suction.

With all that said and the differing recommendations, what is the problem with the fans running all the time? I see them becoming little “wind turbines” and going from using current at low speed to charging the battery at speed.

(sorry for the extreme rambling...just can't get my thoughts together any more)