A/C cooling performance and air circulation

Hi,

I have the car listed above (C model), RWD l with 8-speed automatic transmission.
The A/C is not cooling properly in idle. It becomes less cooling until I feel it is not cooling anymore. It does not happen all the way under the same bad weather conditions and that's why I am confused. I need to know at which temperature should the cooling fan start the high speed and should it work continuously at high speed when the A/C is on. If not, how should it work with A/C on?

The second concern is the air re-circulation system. If the A/C is not in Auto mode and I am keeping the air re-circulation on to prevent external fresh air from entering my car. Is it possible that the car will open the door and override to get air from outside? Sometimes I can hear the movement of the door behind the glove box and I get bad smells from outside. Is it a problem from programming? If I decided to cancel this system by disconnecting the power from the actuators, is it going to have any problem with the system?

Regards,
Abdulrahman