Don't worry about the fans. Use this technique. Get a digetal thermometer and place it in the center vent. Place the temp at "Min" and the blower at low blow.
Drive atleast 50mph for ten minutes and watch the temperature. The thing should cycle the compressor of at about 40 degrees. If you don't cycle the temp should continue to below 30 degrees where icing would occur. This is the only reason we wish the compressor to cycle.
If either cycling or icing doesn't occur then try it again in the cool of the morning. If it still won't cycle at low blow then you have an inefficient A/C. I'm not sure but possible causes could include a recirc door inhaling too much outside air.
Bosch Master, ASE Master, L1
33 years MB technician