With too much refrigerant, the atmospheric pressure of R 12 and R 134 is different. Stop the machine because the temperature sensor is in the refrigerator. You move the dynamic temperature bag to keep him away from the box, set it to the third gear, let the compressor work for a while, and see what the freezer looks like. Take a look and touch the inside of the refrigerator when starting. Does your refrigerant pass through the freezer first or through the freezer first? If you go to the freezer first, it's overcharged. If it enters the freezer first, it means it is not fully charged.