[Daily car maintenance] Cold knowledge that old drivers don’t know: How to use the internal and external circulation of air conditioners?
BarbaraGreen 
8 Hello everyone, this is a column focusing on car repair and maintenance. There are car mysteries you don’t know, and it will teach you how to avoid the big pits on the road of car ownership. I believe that not only you but also many people have a certain sense of obscurity about the car aftermarket, which will help you uncover the unknown stories of car repair and maintenance.
With so many functions on the car, I believe many old drivers may not know exactly how to use each function. It has been decades since the birth of air conditioners in cars, but not many people really understand how to use the internal and external circulation of air conditioners.
In this issue, the editor will interpret for you: what is going on with the internal and external circulation on the car, and how should it be used?
What exactly does an internal and external cycle mean?
There will be internal and external circulation control buttons on the automobile instrument panel. Under different vehicle conditions, press the corresponding button, and the air conditioner will automatically complete the switch between the internal and external cycle.
1 external circulation
The car is a relatively airtight space, so air circulation has naturally become a problem to be overcome. The external circulation is to exchange the air outside the car with the air inside the car to ensure the freshness of the air inside the car.
2 internal circulation
If we know the definition of external circulation, then natural internal circulation is the opposite of it. Internal circulation refers to the self-circulation of air in the car and does not exchange air with the outside world.
Under what circumstances does the second internal and external cycle be used?
See now, in front of the screen is not also understand the difference between the internal and external cycle, but even now, many people still do not know how to use the internal and external cycle.
The following editor will take you to understand the use of internal and external circulation of air conditioners.
The following editor will take you to understand the use of internal and external circulation of air conditioners.
1 the situation of opening the internal circulation
1) Fast cooling
In a hot summer, the temperature in the car can be as high as 40 or 50 degrees, so the air conditioning must be turned on at this time. After turning on the internal circulation, the air in the car will be cooled rapidly to reach the set temperature. If the external circulation is turned on, the temperature will drop very slowly. It will take a long time for the air outside the car to be recooled and re-entered the car.
2) Rapid heating
In winter, it is all too common that the temperature outside the car is dozens of degrees below zero. If you want the temperature in the car to rise rapidly at this time, it is necessary to turn on the warm air, and then turn on the internal circulation.
3) the air quality outside the car is not good
The outer circulation is to introduce the air outside the car into the car, and when the air quality outside the car is not good, it is necessary to turn on the internal circulation. For example, haze, sand weather have to turn on the internal circulation, although there is an air-conditioning filter to filter, but the visibility outside the car is so low, do not expect the air-conditioning filter can play much role.
2 the condition of opening the external circulation
1) long driving time
When driving for a long time, be sure to turn on the external circulation. No matter it is winter or summer, it is necessary to open the external circulation. There is only one purpose, that is, to ensure that the air in the car contains enough oxygen.
If it is an internal circulation for a long time, the oxygen content in the air in the car becomes lower and lower, and the driver will become more and more sleepy due to lack of oxygen. I don’t have to tell you how dangerous it is.
If it is an internal circulation for a long time, the oxygen content in the air in the car becomes lower and lower, and the driver will become more and more sleepy due to lack of oxygen. I don’t have to tell you how dangerous it is.
2) rainy days
On rainy days, we must open the external circulation!
On rainy days, the air outside the car is colder. If the people in the car continue to exhale, the air humidity will increase and the temperature will be very high. At this time, it will start to fog on the front window, so that you can’t see the situation outside at all.
On rainy days, as long as the external circulation is turned on, this kind of fog will not appear, which is simple and labor-saving.
On rainy days, the air outside the car is colder. If the people in the car continue to exhale, the air humidity will increase and the temperature will be very high. At this time, it will start to fog on the front window, so that you can’t see the situation outside at all.
On rainy days, as long as the external circulation is turned on, this kind of fog will not appear, which is simple and labor-saving.
Three summaries:
See now whether you also know how to use the internal and external loop, the function is good, but it must be used correctly in order to give full play to its real function.
More and more interesting car stories are all about repairing cars.
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