How to check the refrigerant leakage of the air conditioner?

　　Refrigeration network: The air-conditioning system has gradually become the standard equipment of cars. There are many types of air conditioners used in existing automobiles, and their structures are similar. The maintenance interval should generally be once a year or as needed. In use, if it is found that the cooling effect is not good, it should be checked. The failure is generally caused by refrigerant leakage. You can check and repair through the following steps.

　　1. Find leaks

　　 The air conditioning systems currently used on vehicles are generally single-cooled on, and the refrigerant is mostly Freon (R12 or Freon’s alternative product 134a). In use, the refrigerant is easy to leak from the connection joints and the oil seal, and the leakage of the refrigerant will cause the phenomenon of poor cooling effect or no cooling.

　　 (1) Check for traces of oil leakage. In the air conditioning refrigeration cycle system, cooling oil is used to lubricate the sealed bearings and other moving parts in the compressor. A small amount of lubricating oil will enter the refrigeration cycle system together with the refrigerant. If the refrigeration cycle system leaks, oil stains will appear at the leak. Therefore, if oil stains are found in the pipeline and joints during the inspection, it can be determined that there is a leakage failure and repairs should be made.

　　 (2) Observe the inspection window to determine the refrigerant leakage. Start the engine (about 1000r/min), turn on the refrigeration control switch (A/C), place the temperature switch lever at the COLD (cold) position, and open the fan switch to the z* position, and the refrigeration can be observed from the inspection window The flow state of the agent is used to determine whether there is leakage in the refrigeration cycle system, as shown in Figure 1.

　　 The flow of the refrigerant is normal: the refrigerant is generally transparent, and the air at the air outlet is cold at this time. The state of the refrigeration system is normal.

　　 Insufficient refrigerant: When the refrigerant is insufficient, bubbles will often flow, the refrigerant is milky white, and the cooling effect is not good at this time.

　　There is no refrigerant: If the refrigeration system leaks seriously, nothing can be seen in the observation glass window, and the air conditioning system will not be cooled at this time. There are two inspection windows A and B on the liquid storage tank of the Fukang car. The inspection window A can determine whether the moisture content of the desiccant in the liquid storage tank is saturated. If it is blue, it means normal; if it is red, it means that the water is saturated. The refrigerant in the air conditioning system should be drained slowly, the desiccant in the liquid storage tank should be replaced, and then the refrigerant should be refilled. The function of the B inspection window is the same as the content introduced above, and it is mainly used to observe the refrigerant.

　　 During the inspection, if oil stains are found on all the connecting parts or the surface of the condenser, it generally means that there is a refrigerant leak. When a leakage is found, the leakage fault should be eliminated in time, and the refrigerant and lubricating oil should be added to prevent the lubricating oil from leaking and damaging the air-conditioning system.

　　2. Check the working condition of the air-conditioning system

　　 During the check, park the car on a well-ventilated place, keep the engine at a medium speed, and turn on the air conditioner to the z* block. Circulate the air in the car.

　　(1) Judge the air conditioner status from the temperature of each part. Touch the air conditioning system and its components with your hands to check the surface temperature. Under normal circumstances, the low-pressure pipeline is in a low temperature state, and the high-pressure pipeline is in a high temperature state.

　　 high-pressure pipeline: compressor outlet→condenser→liquid tank→expansion valve inlet. These parts should be warmed first and then hot. Be especially careful when touching them to avoid burns. If a particularly hot spot is found at one of these points, it means that there is a problem and the heat dissipation is not good. If a point is particularly cold or frosty, it also indicates that there is a problem here, and there may be a blockage. If there is a significant temperature difference between the inlet and outlet of the dry reservoir, it indicates that there is a blockage here.

　　 low pressure pipeline: expansion valve outlet→evaporator→compressor inlet, these surfaces should be from cold to cold, but there should be no frost at the expansion valve.

　　 There should be a significant temperature difference between the high and low sides of the compressor. If there is no significant temperature difference, it means that there is no refrigerant in the air conditioning system and the system has obvious leakage.

　　 (2) Clean up the debris on the air conditioner. Check the evaporator channel and the surface of the condenser, as well as whether there is any debris or sludge between the condenser and the engine water tank (stop inspection). Pay attention to cleaning and clean it carefully. The condenser can be gently scrubbed with a brush, and be careful not to use steam to flush it.

　　 (3) Check and adjust the air conditioner belt. Check whether the belt tightness is appropriate and the surface is intact (the same as the engine belt check and adjustment). If abnormalities are found in the above inspection, repairs should be made.

　　3. Personal protection when maintaining the air-conditioning system

　　(1) Freon (R12) has a large latent heat of evaporation. When it touches the skin and eyes, it will absorb a lot of heat from the human body and evaporate, thus Frostbite human body, so be careful during operation and wear protective glasses to protect your eyes. Once the liquid Freon enters the eyes, do not rub it with your hands. Rinse immediately with plenty of clean cold water (the purpose is to dilute the concentration of Freon), and go to the hospital for treatment immediately. When a large amount of liquid Freon comes into contact with the skin, immediately rinse with plenty of cold water, apply clean petroleum jelly on the skin, and go to the hospital for treatment. Do not rub it with your hands.

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