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With a dual fan setup on the late model cars, both fans run on low when temp is between 92-102. Both fans run on high when above 102C or when AC is running (this is all explained on the Clarks garage page I posted above). There is no individual control for each fan (ie: one runs on high one runs on low).
I believe both fans are controlled/powered through the fan relay, which switches low/high based on the reading from the 3 pin thermo fan switch in the radiator or the AC. Actual fan speed is controlled through the fan resistor.
Wiring diagrams are available in the link I posted above if you want to dig in.
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Tyler from Wisconsin, 1989 944 S2 on Megasquirt PNP
Last edited by walfreyydo; 03-22-2023 at 06:28 AM..
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