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Use one or both thermostats on Fluidyne radiator as relay triggers

I am wiring the relays for the radiator cooling fans.  It is a Fluidyne radiator and it has two thermostats with the same temperature values.  One thermostat is physically higher up on the side of the radiator than the other.  Should I trigger the fans with only one of the two thermostats or use a thermostat for each fan relay?  And, why does the Fluidyne have two thermostats?

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