You actually don't have to do any of this if you have a linear AC pressure sensor. You can just create a AC pressure input and use it and coolant temp as your two axes of the PWM table. You can also add logic to turn the fan off above a certain speed and turn the fans on again if AC pressure or coolant temp rise, regardless of how fast you're moving.
What I showed is better suited for a system where there is no pressure sensor in the AC, but there is an input to the ECU to let it know that the compressor is ON.
Andrew
Last edited by andrewb70; 04-26-2017 at 06:46 PM.
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