Just entering the summer, Xiao Bian heard many car owners' complaints: As the frequency of using air conditioners increases, the car either smells bad, or the air conditioner can't be cooled, or once the air conditioner is used, the car becomes weak ...

It seems that the problem of air conditioning has become an epidemic of cars in summer.

　Symptom 1Air conditioning and refrigeration are not effective."I haven't used the car air conditioner for a long time. Recently, the weather is getting hotter every day. After getting on the bus, I turned on the air conditioner and found that there was a problem. Although there is cold air blowing out, it can only be felt at the air outlet. The cooling effect is not obvious at all, and there is nothing abnormal around the air conditioner. What is going on? "Doctor's diagnosis: refrigerant leakage prescription: adding refrigerant+cleaning.Some car air conditioners have been stopped for nearly half a year, and the refrigerant may have leaked out and needs to be replenished. The owner is in the process of repairing it.When the factory is overhauled, remember to remind the repairman not to forget to clean the evaporator and air-conditioning filter element. Their blockage will affect the refrigeration effect. At the same time, check whether the refrigeration effect of air-conditioning is consistent with the factory index, which is often forgotten by car owners. In addition, the air conditioner should be thoroughly cleaned in summer. There are many cleaning agents on the market to clean the air duct of the air conditioner. Car owners can buy them and clean them themselves, or they can go to a 4S shop or a car decoration shop and ask someone to handle them.Symptom 2It is difficult to start an air-conditioned car."My car's displacement is only 1.0L Usually I don't use air conditioning, mainly because it was too hot two days ago, so I turned on the air conditioner. I think it will be more difficult for the car to start than usual. It is impossible for a car with a small displacement to use air conditioning!"Diagnosis: Engine overload Prescription: Turn on the external circulation of air conditioner first.In summer, the temperature of a car parked in the scorching sun may be as high as sixty or seventy degrees Celsius, so you should put the car first.When the doors and windows are open, you can use the fan to ventilate first, and then wait for two or three minutes before you go in and start the car. At this time, don't close the window in a hurry, first turn on the external circulation of the air conditioner, and then close the window and use the internal circulation when the temperature inside and outside the carriage is similar. Although it is a little hot at first, it avoids the excessive load when the engine is started, and it is also convenient for the air conditioning compressor to enter the working state soon.Symptom 3The air outlet only emits hot air."Now my air conditioner is turned on, not only it doesn't cool, but also the air outlet only emits hot air. I originally wanted to cool down the hot weather, but the result is getting hotter and hotter. I don't know where the problem is."Diagnosis: evaporator damage prescription: air conditioning system cleanerExperts pointed out that the air outlet of air conditioner is actually very particular. According to the physical principle of air circulation, cold air will sink and form convection with hot air. Therefore,When the air conditioner is turned on, the air outlet is upward, so that cold and hot air convection is formed in the car, and the cooling speed is improved.After removing the filter screen of the air conditioner, find the evaporator of the vehicle. The evaporator will condense moisture in the air during refrigeration, and adhere to dust and dirt to breed bacteria. At this time, it is necessary to fill the surface of evaporator and the original space of air conditioning filter screen with "automotive professional air conditioning system cleaner".Symptom 4The air conditioner squeaks when it is started."After I turned on the air conditioner, the starting sound of the air conditioner was irregular. There was a sound once, then it disappeared, and then it started again. After starting, the air conditioning at the air outlet of the air conditioner was delivered normally, that is, there was a squeak every few minutes. What is this situation?"Diagnosis: component damage prescription: carpet inspectionAbnormal sound of air conditioner is generally abnormal sound of air conditioner compressor, which can be found near the air conditioner compressor.Feel the noise. This kind of abnormal sound is generally caused by the air and moisture mixed in the refrigerant composition. If the situation remains the same after adding refrigerant, and the abnormal sound position is located near the compressor, then the internal mechanical structure of the compressor is more likely to be damaged; If the abnormal sound recurs after a period of time and is located in the center console, the efficiency of drying bottles is likely to decrease. After successive investigations, we can find the key to the problem before we can prescribe the right medicine.Symptom 5The air conditioner still smells after cleaning."I will clean the air conditioner myself every summer before I come, just for fear of odor, but not long after cleaning this year, I found that the air conditioner still smells, and the air conditioner has been useless for a long time. Is it necessary to change it?"Diagnosis: Wrong car habits Prescription: Turn off the air conditioner before parking.The odor of air conditioning is mostly caused by the accumulation of condensed water in the air conditioning pipe, which forms a dark and humid environment, which makes mold multiply. Light cleaning is a way to treat the symptoms instead of the root cause, and we should find problems from our daily driving habits. Many people are used to turning off the air conditioner as soon as they stop, which will cause condensed water to accumulate in the pipeline. These condensed water will attach to the surface of the evaporator together with the dust and impurities in the air, which will breed a large number of bacteria and pollute the air in the whole car with the wind blown out by the air conditioner. Turn off the air conditioner three or five minutes before arriving at the destination, or turn off the air conditioner power supply at the destination, keep the fan idling, appropriately increase the air volume, and raise the temperature in the air conditioning pipeline before stopping, so as to reduce the generation of condensed water and keep the air conditioning system dry. Experts also reminded that some people use air fresheners or perfumes to cover up the smell of air conditioners, which is not only useless but harmful. To solve the air odor, professional equipment should be used to thoroughly disinfect the air conditioners and air ducts.