After Qingming Festival, the days are getting hotter day by day. Nowadays, people in southern my country are wearing short sleeves. You can imagine how hot it is in the car when driving with the windows closed. And the annual "air conditioning season" is naturally "on the agenda." Summer is here, and the problem of poor cooling effect of car air conditioners is becoming more and more common.

Many car owners went to the repair shop to check the air conditioner, and were told that it was leaking here, missing there, how to repair it, what parts needed to be replaced... The quotations were several hundred dollars higher. But have you ever doubted the possibility that maybe your car isn’t broken after all? Can it be restored to the original state with just a few simple steps? ——Today we will talk about such a situation and help you save money!

Everything starts with the basic principles

You will not be cheated!

One of my famous sayings from Brother Hu (I think): Once the basic operating principles are explained clearly, then all complex phenomena will be easily explained. If the car air conditioner is not good at cooling, you still have to start with the basic principles of car air conditioners. I still remember that I once said that the essential principles of car air conditioners and home air conditioners are the same, and they are both composed of the "Four King Kong".

The "Four Diamonds" are: compressor, condenser, throttle valve, and evaporator. The working process of automobile air conditioning is (if you find it boring, you can ignore this section):

——The compressor is actually equivalent to an air pump, which pumps low-pressure Freon in and pressurizes it, and turns it into high-pressure and high-temperature Freon for output;

——After the high-pressure and high-temperature Freon flows into the condenser, it begins to dissipate heat to the outside. After the temperature drops to room temperature, the gas Freon naturally transforms into a liquid state;

——Then the liquid room temperature Freon passes through the throttle valve , the so-called throttling is nothing more than a small "pinhole". After the liquid room temperature Freon passes through the "pinhole", the temperature drops to about minus 20 degrees;

——Finally, it is sent to the evaporator, and the Freon It absorbs heat from the outside and boils in the evaporator, becoming a gas again.

The front air conditioning condenser is blocked

It will also cause the air conditioning effect to deteriorate

With the help of the compressor, Freon circulates in the air conditioning pipeline. , sometimes it is endothermic (absorbing heat from a low-temperature state and changing from cold to hot), and sometimes it is exothermic (releasing heat from a high-temperature state and changing from hot to cold). The evaporator is responsible for absorbing heat, and the condenser is responsible for releasing heat.

The evaporator box is equivalent to the "indoor unit" of our home air conditioner, and the condenser is equivalent to the "outdoor unit" of our home air conditioner. This is the correct understanding! The evaporator box is generally not broken. At most, it will be damp and moldy, and it will not be blocked by dirt (because most car air conditioners have "air conditioning filters" in the car that can block dust from entering the evaporator box. It is only a very small number of cars that save costs. No such thing)

But the condenser has no filter element or filter protection! The condenser is located at the front of the car. When the car is driving, dust, small leaves, catkins, rainwater, insects... will be "blown in" directly from the car's grille. There was no problem for a short period of time, but after years and months, these things became clumps and clogged on the air conditioner condenser...

In the end...of course the cooling effect of the condenser was terrible! For example, if you use a cover to cover the "outdoor unit" of your home's air conditioner, the huge heat cannot be dissipated when the "outdoor unit" is working... so your home's air conditioner will "go on strike". The truth is really that simple!

Most often occurs on old cars

Just clean it, no other repairs are needed

We have seen too many older cars, and they all say air conditioning The air-conditioning effect was poor. When we checked, we found that the condenser at the front of the car was too dirty, and the surface was covered with dirt like cotton wool. Then do you think the air-conditioning effect can still be good?

So, if the air-conditioning cooling effect of an older car is not good, the correct solution is to find a reliable repair shop and check whether the condenser is dirty first. If it is really too dirty, then cleaning is done. Blow the condenser from the back "inside out" with a high-pressure air gun, and then rinse the condenser with a water gun.

After cleaning the condenser, check whether the air conditioning of the air conditioner is very powerful. If the situation improves immediately and the air conditioning is very cold, it means you are done! If it still doesn't work, check the temperature of the air conditioning pipe (temperature difference between high-pressure pipe and low-pressure pipe). Then add Freon to the air conditioner according to the actual situation...

Pay attention to the engine compartment regularly

It is a good habit that does not cost money

In fact, our normal cars , you can also pay attention to the air conditioning condenser at the front of the car regularly. Because at the front of the car, in addition to the air conditioning condenser, the cooling water tank of the car engine is also here. If the air conditioner condenser is blocked, basically the engine cooling water tank will also be blocked, and the engine will not be able to escape the high temperature.

Developing a good habit of regularly checking the engine compartment has only advantages and no disadvantages! There is no need to be too diligent, just checking it once a month is enough. If you don’t take care of your own car, who else will take care of it for you? Are you right? Therefore, in older cars, the air-conditioning effect becomes worse, and the reason is that the condenser is too dirty, and there is no need to spend any money to deal with it. When faced with the sky-high repair fees quoted by the garage, you can also "keep an eye out".

This article comes from Dahu You, the author of Yichehao. The copyright belongs to the author. Please contact the author for any form of reprint. The content only represents the author's opinion and has nothing to do with Bitauto