The only way to do it is to turn on the climate control by pressing either the down arrow (air to feet) or the right arrow (air to face vents).
If you do that the fan automatically changes speed, I usually run slow fan meaning you need to press the slower fan speed 3 times to get there after turning on the climate, and to push the down or right once more if you don't want that selected.
Otherwise all other buttons turn the AC on, and if you have the temp set high enough, like 68 at this time today with the temp outside around 55, then the heat comes one along with the AC, big waste of battery. You can see the heat on with the climate screen on the left screen. Heat is usually off at or below 65F, generally I leave mine at 62 if I don't want heat, then turn it up if the engine is running after the temperature of the engine reaches 1/2 on the gage in my view, otherwise the electric heat will come on to assist the engine to warm up the coolant (again, seen in the climate power draw screen).
Hope this helps, and let me go and delete some PM, I get questions there often, thanks for letting me know.