E60 AC when set to "auto", fan blower never changes the speed
 

When my heater/AC is set to "Auto", it doesn't seem like the blower speed never changes. For instance, I set it to 75 degrees/auto, and regardless of the weather, it will blow very moderately.

I do see a sensor error code about the condensation sensor that's attached to the front windshield. I doubt it's related?

are you comfortable with doing coding on your car? you can set the fan control light to illuminate with climate control set to auto, that will tell you right away if your fan speed is changing. I did it on my car when I was coding in some other things.

Have you changed the intensity of the AUTO program? In the owner's manual it tells you how to do it but I have attached a picture for you explaining it as well, I have highlighted it in red.
https://cimg9.ibsrv.net/gimg/5series...7b87217ebd.png