Cooling Fan Tech

[Satan's_Minion]

The thermostat should be wide open before the fans ever turn on. Otherwise the thermostat is holding back the fans.
So one could run a 160° thermostat to make sure it’s wide open.
Problem is if the radiator and fans work too well the cold returning water temp will try to close the thermostat and restrict flow while the fans are still running and waste energy.
The thermostat is going to have a lag to open and close and fight the fans.
Let the fans control the temperature and there is no need or purpose for the thermostat.
Eliminate a failure point and restriction.

Interestingly the cooler manufactures want the thermostat fully open as well. If you are constantly open/closing the thermostat you can get to a steady state with too low of a flow rate in the heat exchanger which leads to a temperature differential across the header and non uniform stress from the difference in expansion.

In a car you may need the thermostat to close to maintain engine temp for heating/emissions in some parts of the drive cycle. Performance application who cares.