The temperature has been rising rapidly in recent days. If after turning on the air conditioner in the car, the cooling speed is very slow or it is not cold enough, and a sour smell wafts out of the air conditioner, the rest of the drive will become very torturous. Kas will explain to car owners why their car air conditioners are not cold or produce odor, and share methods for cleaning and repairing car air conditioners.
Reasons why the air conditioner is not cold
Refrigerant leaked
Refrigerant will automatically consume about 5% a year. However, if the relevant pipes or parts break, it will cause the refrigerant to leak out and be lost.
Compressor abnormality
The compressor mainly compresses the refrigerant from low-pressure gas to high-pressure to complete the refrigeration and air-conditioning cycle. Therefore, if the high and low pressures of the compressor are abnormal, the air conditioner will not be cold.
Expansion valve failure
The expansion valve is mainly used to convert high-temperature and high-pressure liquid into low-pressure and low-temperature liquid (atomization). It is a switch that adjusts the flow of refrigerant entering the evaporator. Therefore, when the expansion valve is blocked or abnormal, it will cause pressure instability and air-conditioning outage.
Condenser heat sink is dirty
The function of the condenser is to dissipate heat. When the heat sink is dirty, it will affect the heat dissipation function and the cooling effect will of course be greatly reduced.
Refrigeration oil deteriorates
Contamination, deterioration or insufficient refrigeration oil will affect the lubrication of the compressor. When the friction resistance of the compressor increases, the temperature and pressure will increase, and the air conditioner will not be cold. Evaporator dirty
The evaporator is responsible for removing the heat from the refrigerant. If there is dirt hidden in the radiator, it will also lead to poor heat dissipation and the car's air conditioner will not be cold.
Reasons for the peculiar smell of air conditioner
Evaporator moldy
When the car's air conditioner is running, moisture in the air will condense and adhere to the blades of the air conditioner's evaporator. When it accumulates to a certain extent, water will drip. If the car owner turns off the vehicle immediately when parking, the condensed water droplets in the air-conditioning pipe are not dried up. Over time, it is easy for the evaporator to become moldy. After that, whenever the air conditioner is turned on, a sour smell will blow out.
If the odor has been occurring for a period of time, it is best to clean the evaporator directly to cure the problem. After opening, you can usually see a thick layer of mold attached to it, which not only makes the air conditioner smell bad, but also reduces the air flow, causing the air conditioner to not be cold. Because the blown air is full of mold spores, it can easily cause allergies, asthma, runny nose, chronic fatigue, unexplained headaches and other symptoms, seriously affecting human health.
To prevent the evaporator from getting moldy, it is recommended that you turn off the air conditioner for a period of time before turning off the engine (the vehicle is stationary for more than a few hours) to reduce the chance of moisture remaining on the evaporator.
Filter dirty
The air-conditioning filter usually filters out foreign matter in the air. It may get stuck with bug corpses or dirt. When the air passes through, it will naturally bring the odor into the car, so it must be replaced regularly. However, each car owner's car usage habits are different. If you drive frequently or the air quality in the driving environment is poor, the replacement frequency can be increased. Some people will replace it as soon as there is an odor, while others will replace it every six months. But no matter what, it is recommended to replace old ones with new ones at most every year, and don’t let your lungs become the air purifier in the car.
Strange smell remains in the air duct
If there is still a strange smell after cleaning the evaporator and replacing the filter, it is likely that the air duct needs cleaning. Because when the air is sent into the car, bacteria will remain in the air duct, so even if the filter is replaced, it will only treat the symptoms but not the root cause. If the odor is not serious, car owners can buy air-conditioning cleaning agent to clean the air outlet. However, if the degree of contamination is too serious, it is recommended to go to a professional car warranty center for a thorough cleaning.
There's a small animal stuck in the car
If the car is normal at ordinary times, but suddenly smells bad in autumn and winter, after ruling out mold, it is likely that small animals hid in the car to keep warm and were unable to escape and died, resulting in a corpse smell. In addition, if insects accidentally enter the car and build a nest, their excrement will also produce a smell. Once these objects are removed, the odor problem can usually be resolved.
CARs air conditioner escape ring sterilization maintenance
Cass focuses on cleaning the air-conditioning system and replacing refrigerant to solve odor and bacterial problems, ensuring the normal operation of the air-conditioning system and good cooling effect, allowing your car to regain fresh and cool air.