good question. i have a single fan on the outside of my i/cooler but in traffic it get alarmingly hot. the fan is pants, blows as much as pulls air through. i tried turning the fan blade but its still no good. i put it back as its supposed to be but im currently after a better setup. if the fran is rotating the wrong way (the motor, not the fanblade) how can you reverse the direction? swappin wires on the motor has not worked.