What are the reasons for the frosting of automobile air-conditioning compressors

Automobile air-conditioning compressors are commonly used machines, but our daily improper maintenance will also shorten their lifespan. Frosting is a common situation in compressors. The following mainly introduces several major causes of frosting and air conditioning maintenance methods.

1. Too much refrigerant

Too much refrigerant charged by the car owner will also cause frosting. This is because the internal charge is too much, which occupies part of the condenser's internal volume, which increases the condensing pressure and increases the amount of liquid entering the evaporator. The liquid in the evaporator cannot be completely vaporized, so that the gas sucked by the compressor contains liquid droplets. In this way, the temperature of the return air pipe drops, but the evaporating temperature does not change because the pressure has not dropped, and the superheat is reduced. At this time, the car owner can actually see obvious frosting.

2. Insufficient refrigerant

Why does the lack of refrigerant cause the compressor to frost? In fact, this is also something that many car owners can’t figure out. Because the amount of refrigerant charged by the car owner is insufficient, the frost produced by the refrigeration in the evaporator will continue to condense on the compressor and condense. The air conditioner does not get enough refrigerant, which causes the so-called frosting phenomenon.

3. Refrigerant evaporation problem

Due to the external reasons of the car, the refrigerant does not evaporate or even evaporate in the evaporator. At this time, the compressor will start to form frost, and in severe cases, it may even cause wet compression.

4. Central air-conditioning problem

Many car owners think that the central air-conditioning problem has something to do with the compressor. In fact, it has a certain relationship. Because the central air-conditioning return air is insufficient or the air-conditioning box filter is seriously blocked, at this time the main compressor return pipe of the chiller will appear frost. At the same time, the temperature of the exhaust gas will be very low.

The above introduces the related content of the reasons for the frosting of the automobile air-conditioning compressor. Let's take a look at the maintenance methods of the automobile air-conditioning.

Daily use habits should be cultivated

1. Don't smoke in the car

Usually when driving on the road, I believe you will also see many car owners smoking while driving, and from time to time they put their hands out of the car window and puff out a few puffs as if the car is smoking. These car owners who smoke think that they will be fine as long as they blow the smoke outside, or they don't care at all. In fact, this is a problem.

First of all, the smoke cannot be sprayed out completely, even if the air conditioner is externally circulated. The space inside the car is inherently small, and smoking will make the air in the car, which had been poorly ventilated, become more turbid. Moreover, if the internal circulation of the air conditioner is turned on, the smell of smoke will be sucked into the air conditioner duct, which will also pollute the car air conditioner. In this way, even if you don’t smoke, you will have a peculiar smell when you turn on the air conditioner, and other people in the car will be forced to smoke "second-hand smoke. Therefore, some car owners who smoke frequently will have a particularly strong odor in the car.

2. Turn off the air conditioner in advance when you get off the bus

As mentioned above, the air conditioner sometimes smells because of the growth of mold and bacteria inside the air conditioner, which is also closely related to the air conditioner's habits. One very important reason is that car owners are used to turning off the engine directly after parking the car, without turning off the air conditioner, and wait until the engine is turned on when driving next time, and then let the air conditioner turn on automatically.

In fact, this habit is very bad, because the cold air inside the air conditioner can't be discharged, which causes water and humidity inside the air conditioner, which will cause mildew inside the air conditioner over time. In fact, it is very simple to avoid this situation, as long as you usually turn off the air conditioner a few minutes in advance before arriving at your destination, and let the natural wind blow for a while, the moisture in the internal ducts of the air conditioner can be discharged. The air conditioning system is kept relatively dry, which can effectively avoid mildew. If you are really hot and don't want to turn it off early, at least you can park the car and turn off the cooling and let the natural wind blow for a while.

3. Not the colder the better

In hot weather, some car owners like to turn the air conditioner to the coldest, which is not good. First of all, the hotter the weather, the greater the temperature difference between inside and outside, it is easy to make the body uncomfortable when one goes in and out. In addition, the low temperature combined with the confined environment and the unblocked air can cause dizziness, dizziness and other undesirable symptoms for people sitting in the car, and even cause air-conditioning disease. Especially when there are children and the elderly, the temperature of the air conditioner should be appropriate, generally above 22°C.

4. You can clean the air conditioner yourself

The air conditioner not only has an air conditioner compartment, but the pipeline inside also needs maintenance. For example, when the above-mentioned air-conditioning odor appears, it is necessary to consider cleaning the inside of the air-conditioning system, otherwise, even if the air-conditioning filter element is replaced, it is not very useful. We can consider buying an air conditioner cleaner by ourselves, and then clean the air conditioner.