Just set the temp you want, put it on auto with the aircon on. The car will sort the rest. Putting the fan up to max actually makes it heat up slower as your blowing all the heat out of the matrix before its built up. Once the matrix is hot enough, the car will bump the fan speed and direction as required.
57 Sapphire Black E91 330d M-Sport
Privacy Glass // Leather // Heated Seats // Bluetooth // Blacklines // BMWP Gloss Black Grille // Alpine HiFi // LCI Headlights