Defrost will force the A/C compressor on in order to dry out the interior.
31.5C is 89F. Do you really want your interior this hot?
The next time you're on a long drive, set the temperature to what you find comfortable and leave it there.
Cranking the knob on a cold start defeats the purpose of automatic climate control. The system does its best to bring the interior to where you want it based on available engine heat. The fastest way to warm up the interior is to drive the car.