1. If the air duct machine is overloaded, it will lead to loud freon flowing sound. 2. It is also possible that there is a blockage in the tuyere, or the motor is broken. 3. Freon is mainly in the closed pipeline system. When it works, it will change from gas to liquid, and then from liquid to gas, and it will be continuously circulated to achieve the refrigeration effect, so there will be a slight noise, which is a normal phenomenon. If there is a problem of excessive sound, it means that the machine has a fault and needs to be repaired. Suggested solutions: 1. You can find a special after-sales person to check whether there are any problems with the parts of the air duct machine, such as the compressor coil and solenoid valve, and then repair them after determining the specific problems. If they cannot be repaired, the parts need to be replaced. 2, at the same time, according to the indoor temperature to adjust the temperature of the air duct machine, to avoid the temperature setting is too low, leading to the air cooler has been in a working state, there is no way to stop. 3. Avoid the overload operation of the machine, which will not only cause the problem of loud freon flowing sound of the air duct machine, but also affect the service life of the air duct machine and cause long-term failure. 4. If the cooling effect is poor during use, it may be because of the lack of freon in the air duct machine, which needs to be added in time.