Using HP Tuners, you select the type of fan. My hemi has the PWM linear.
Then adjust the required high, low temps, BUT, then there is a PWM desired ECT (engine control temp) setting. Change there to set the fan activation temp.
Yes fan must always spin slowly.
Make sure the power steer fluid is correct hydraulic type and clean.
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2010 GC 5.7 hemi, OME lift
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