I know the A/C drags on the car, but you're not really using "more" A/C by turning up the fan, either the A/C is on or it's off, right? The fan is a separate entity?
Is there a significant difference in energy used between the A/C fan on high or low?
No significant difference.
On a long run, however, since the alternator has to generate more current on the 'high' setting to keep the battery topped up, you will be using that much extra fuel to cater for this extra effort (by the alternator). An alternator under load uses up a bit more fuel than otherwise. This extra bit may add up.
Reply:Actually no difference in energy is used to turn the blower motor on high as low. Because lower fan speeds there are resistors used to slow down the motor. So motor load + resistance lower fan speed. High fan speed is direct to battery voltage thru the motor. Report It
Reply:JP Report It
Reply:There is NOT a significant difference between speeds. As for gas mileage, it takes less gas to run the AC than it does to drive with open windows because of the aerodynamics of the cars today.
Reply:You are correct. The fan switch for hi/low simply will have a higher current drain on the battery, whereas the ac compressor simply has a load on the engine via the drive belt
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