Truck came back out due to second floor. AC is freezing tech was here last Friday and found the second floor. AC was overcharged and had a severe restriction in the lines. The airflow to the second floor. AC was also very high reading 500 to 600 CFM at that time lower the fan speed a bit to adjust for a better temperature split though technician got a better temperature split at that time over the weekend. The coil began to freeze as the restriction inside the system was too great for the new fan speed to overcome tech informed client unfortunately this appears to be an installation error. As the second floor system simply has too much refrigerant and a severe restriction which is causing the system to be inefficient. Tech has increased the fan speed back to its original setting. Tested system again system is no longer freezing. However the temperature split is very low reading 10 to 12°F. Ideally system should be 17 to 20°F temperature split. Client thanked us for coming out and will