If the copper tube of the air conditioner is flat, the simplest and most direct way is to cut it off and then weld it. I really can't help it. You can heat the copper tube with fire and then tap it gently with a hammer. Expansion: the solution of air conditioning without refrigeration. 1, the problem that the air conditioner does not cool can be solved by adding fluorine. 2. The power space of the air conditioner needs to match the cooling capacity. 3. Change the use environment of the outdoor unit (away from the high temperature environment or make the air around the outdoor unit easier to circulate). 4. Clean and maintain the air conditioner so that the clean outdoor unit can dissipate heat later. Refrigeration principle: the compressor compresses gaseous Freon into liquid Freon with high temperature and high pressure, and then sends it to the condenser (outdoor unit) for heat dissipation, so the outdoor unit blows out hot air. Liquid Freon enters the evaporator (indoor unit) through the capillary, the space suddenly increases, the pressure drops, and the liquid Freon will vaporize and become gaseous low-temperature Freon, thus absorbing a lot of heat, and the evaporator becomes cold.