My opinion, for what it’s worth: David (post #7) is right.
It doesn’t matter where the temperature sensing element is placed on the radiator: top, bottom, or anywhere in between. The function is the same.
That is, assuming the set point (temperature at which the fan switches on) can be adjusted. It is then simply a question of adjusting the set point according to where in the cooling circuit the sensing element is placed.
I’ve done experiments to satisfy myself that this is indeed so.
Also, plumbing or other efforts to try and get the sensing element to be inside the coolant space is a complete waste of time! The sensing element can simply sit on the outside of, for example, the top tank, so as to be in reasonably good thermal contact with the outside surface of the tank. Very simple and cheap, and easy to get at.
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