Vehicle air conditioner inspection method
At present, the air-conditioning system used in vehicles is generally a single cold-opening type, and the refrigerant uses Freon (replacement product 134a of R12 or Freon). In use, the refrigerant leaks from the joints and seals, and leakage of the refrigerant will result in poor cooling or no refrigeration.
(1) Check for signs of oil leakage. In an air-conditioning refrigeration cycle, the cooling oil is used to lubricate the sealed bearings and other moving parts in the compressor, and a small amount of lubricating oil will enter the refrigeration cycle together with the refrigerant. If there is a leak in the refrigeration cycle system, there will be oil in the leak, so during the inspection, it was found that the pipeline and joints were spotted with oil, and it was confirmed that there was a leak at the site and that repairs should be carried out.
(2) Observe the inspection window to determine refrigerant leakage. Start the engine (approx. 1000r/min), open the cooling control switch (A/C), place the temperature switch lever in the COLD (cold) position, switch the fan switch to the maximum position, and observe the refrigerant from the inspection window Flow status to determine whether there is leakage in the refrigeration cycle system.
The refrigerant flow is normal: the refrigerant is substantially transparent, and the air at the outlet is cold. The status of the refrigeration system is normal.
Insufficient refrigerant: When the refrigerant is insufficient, bubbles often flow, and the refrigerant is milky white. At this time, the cooling effect is not good.
No refrigerant: If the refrigeration system is seriously leaking, nothing can be seen in the observation window, and the air conditioning system will not be cooled. This will depend on the two inspection windows A and B on the vehicle tank. 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 slowly drained, the desiccant in the tank replaced, and the refrigerant refilled. The function of the B inspection window is the same as the one described above, and is mainly used to observe the condition of the refrigerant.
During the inspection, if any oil is found on the joint or on the condenser surface, it is generally indicated that there is a refrigerant leak. When there is a leakage, it is necessary to promptly eliminate the leakage fault, supplement the refrigerant and lubricating oil to prevent leakage of the lubricant and damage the air conditioning system.
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