Every car I've previously owned with automatic climate control has worked similarly to the best of my knowledge. The fan speed would vary according to the difference between the actual and desired temperature in the cabin. My recently acquired 2012 e93 does not adjust the fan speed in the automatic position. I must choose one of five fan settings. For the cabin temperature to stay at my desired setting, apparently the temperature of the delivered air must vary. Is that correct? Isn't that less efficient than varying the fan speed? Just curious.