There are many connecting points an

There are many connecting points and connecting pipes between the internal parts of the refrigeration system, including the soft conduit between the air conditioning compressor and the condenser, which is easy to cause blockage. Similarly, the lack of refrigerant circulation and flow in the refrigeration system will result in the failure of the automobile air-conditioning system. It is conceivable that a pressure test on either side of the non-circulating pipe could detect a blockage in the cooling system if one side was too high due to excessive blockage and the other side was too low due to lack of refrigerant. At the same time, the reservoir dryer and the expansion valve is also very easy to produce the phenomenon of blockage. For liquid dryer and expansion valve plug can be detected by the injection of nitrogen (using nitrogen composition is the cause of the nitrogen has three chemical bonds between atoms, relatively stable chemical properties, not easy to be damaged, and other gases such as oxygen easily to the chemicals within the automotive air conditioning, resulting explosion risks, etc.) If there is no obvious gas discharge at the outlet, it can be proved that the outlet is blocked and a replacement operation is needed.