What is the reason why the car air conditioner is not cooling? Let's check it together!

For car air conditioners, the most common problem we encounter is that after a winter, when the air conditioner is turned on, we find that the cooling capacity of the air conditioner has decreased; even some vehicles have hot air from the air outlet of the air conditioner. What is the reason why the car air conditioner is not cooling? What should I do if the car air conditioner is not cooling?

The reason why the car air conditioner is not cooling

The car air conditioner is not cooling, the car air conditioner is not cooling enough and sometimes it is not cooling. Most of them are caused by the refrigeration system. In addition to requiring the maintenance workers to have a good diagnostic thinking and method during the maintenance process, it also requires careful and meticulous maintenance in order to completely eliminate the fault. Nowadays, cars are basically equipped with air conditioners, which can provide the driver with a comfortable environment in the car in different seasons. However, when the air conditioner works for a long time, various failures will occur, especially The phenomenon of insufficient refrigeration is also more common, so today I want to discuss with you the principles of automobile air-conditioning, the reasons for the failure of insufficient refrigeration, and overhaul. Before understanding the reasons why the car air conditioner is not refrigerated, let us first understand the working principle of the car air conditioner refrigeration system and the composition and function of the air conditioning system!

Car air conditioning system is abbreviated as car air conditioning system. Its main purpose is to provide passengers with a comfortable environment in the car under any climate and driving conditions. People's requirements for the environment are often different due to physical fitness, age, sex, habits and health status. But under normal circumstances, most people's requirements are still roughly the same. Suitable temperature, suitable humidity, suitable air flow and clean air constitute the three elements of air conditioning: temperature, humidity and cleanliness. A complete automobile air conditioning system achieves the purpose of creating a comfortable environment in the cabin by adjusting temperature, humidity, wind speed and ventilation, etc.

1. The general composition and function of automobile air-conditioning system. The air-conditioning system is generally composed of the following five systems:

(1 ) Refrigeration system: Cooling or dehumidifying the air inside the car or the fresh air entering the car from the outside, making the air inside the car cool and comfortable.

(2) Heating system: Mainly used for heating, heating the air in the car interior or the fresh air entering the car interior from the outside to achieve the purpose of heating and dehumidification.

(3) Ventilation system: suck external fresh air into the car room for ventilation and air exchange. At the same time, ventilation also plays a good role in preventing fogging of the windshield.

(4) Air purification system: remove dust, odor, smoke and toxic gases in the air in the car interior, so that the air in the car interior becomes clean. Control system: Control the temperature and pressure of the refrigeration and heating system, and control the temperature, air volume, and flow direction of the air in the car at the same time, which improves the normal operation of the air-conditioning system.

Second, the working principle of automobile air-conditioning refrigeration system

(1 ) The working principle of the automobile air conditioning refrigeration system The automobile air conditioning refrigeration system is composed of a compressor, a condenser, a liquid storage dryer, an expansion valve, an evaporator, and a blower. As shown in Figure 1, the various components are connected by copper pipes (or aluminum pipes) and high-pressure rubber pipes to form a closed system. When the refrigeration system is working, the different states of refrigeration memory circulate in this closed system, and each cycle has four basic processes:

1. Compression process: the compressor sucks in and evaporates The low-temperature and pressure-resistant refrigerant gas at the outlet of the compressor compresses it into high-temperature and high-pressure gas and removes it from the compressor.

2. Exothermic process: the superheated refrigerant gas of high temperature and high pressure enters the condenser. Due to the decrease of pressure and temperature, the refrigerant gas condenses into liquid and releases a large amount of heat .

3. Throttle process: The volume of refrigerant liquid with higher temperature and pressure becomes larger after passing through the expansion device, and the pressure and temperature drop sharply. ) Exclude expansion devices.

4. Heat absorption process: The mist refrigerant liquid enters the evaporator, so the boiling point of the refrigerant is much lower than the temperature in the evaporator, so the refrigerant liquid evaporates into a gas. In the evaporation process, a large amount of surrounding heat is absorbed, and then the low-temperature and low-pressure refrigerant vapor enters the compressor.

The above process can be carried out repeatedly to achieve the purpose of reducing the air temperature around the evaporator.

Uncooled or insufficient air-conditioning in automobile air conditioners are common faults of air conditioners. The basic maintenance methods can be mastered by ordinary maintenance workers, that is, start with easy parts and observe Finding the cause or location by ear listening is called sensory inspection method, while another inspection method, meter inspection method, is easy to be overlooked. This method can often help find the cause of the fault accurately and quickly.

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