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I'm surprised the ECU doesn't do this already. Even back in the 90s, GM cars had this functionality.
I remember playing with that in TunerPro, in a previous car. IIRC, it was set to turn off the fans at 55mph, from the factory. I dropped it to 40, and had no overheating issues. But that car had a front splitter and a hood vent (basically a race car). So the radiator got lots of airflow.
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