The fan icon just lets you know if the HVAC fan is running or not. The climate option lets you set heat and cool as well as temperature, seat warmers, etc. I found the fan icon to be useful on one occasion. I had randomly checked the app and saw that the fan was running even though the car was parked. I went to check and found that I hadn't completely closed one of the doors, and that was enough to leave the A/C running. If I hadn't seen this, I can only imagine where my charge level would have been the next morning when I decided to drive to work.