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I don't know, maybe fan 1 on at 175* and off at 160 then fan 2 on at 185 off at 165?
Since you have a 160 thermostat, and you should have enough cooling capacity, when you're cruising the car should stay around 160-165 without the fans. I don't see why you would want the car to get much higher temp than that when you're sitting still.
If someone wants to call me out on my logic, please do.
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