Arrived to remedy a system that is freezing up. Checked the evaporator coil to ensure it is not coated in ice. Kicked system on and found it operating like normal. Checked the refrigerant levels and found them off. Performed diagnostic and found that the metering device for the refrigerant is in need of adjustment. Slowly made this adjustment, constantly checking refrigerant gages outside. Once metering device was calibrated properly made the necessary adjustments to the refrigerant levels. System is functioning properly at this time.