2013 Coupe V-6 Fan AC noise
 

hi all - when driving at 50mph or more on a hot day, a/c running on auto, I hear the fan changing speed where it it blowing from vents to windshield ? pretty loud or it sounds like it may be taking in air from the outside for a minute then quiets down.
anyone else ?

Auto climate control? My guess is that based on measuring temperatures inside the cabin, it's switching between floor vents & dashboard vents. Also just changing blower speed?

sounds like the fan is changing but it is loud. Also sounfs like it is pulling outside air in.

It sounds like the Eco button is on. I had a similar problem with mine. just turn off eco and it should be good.