Reasons why car air conditioner not cooling?

Reason 1: After the car moves, the wind speed of the condenser is large, and the heat exchange effect is good, so the effect is naturally good. When idling, the temperature around the condenser is high, the wind speed is small, and the refrigerant cannot be cooled, so the effect is not good.

If everything used to work and now it doesn't, it's that the fan of the car condenser is broken.

Reason 2: It may also be that the condenser does not dissipate heat resulting in the air conditioner is not cool, especially the gap between the condenser and the water tank, if it is not cleaned for many years, it may be blocked, and the high-pressure air pump needs to be blown or removed for cleaning.

Reason 3: It may also be the lack of refrigerant, resulting in insufficient refrigeration dose in the air conditioning system pipeline, the pressure decreases, and the heat taken away becomes smaller, which will give people a feeling that the air conditioner only blows air and does not refrigerate. Generally speaking, there will be a slight leak in the air conditioning line or condenser, which is a normal phenomenon.

Here's why:

1. Lack of refrigerant.

The loss of refrigerant is mainly leakage, if your car has poor air conditioning, and after a period of time after filling the refrigerant, then you should pay attention. A relatively simple method is suitable for leakage, you can see through the middle grid that there is oil and dampness on the surface of the condenser, and in this case, the condenser is generally leaking.

2. The condenser is too dirty.

In summer, it is often found that the air conditioner is poor, and when you go to the 4S shop to repair the car, it is often recommended that the owner do an activity to clean the water tank. The purpose of cleaning the water tank and condenser is mainly to dissipate heat, and the poplar catkins are pasted on the condenser, which will cause the engine temperature to be too high or the air conditioning is poor. When cleaning, you must pay attention to blowing it clean with a blow gun first, otherwise it will be counterproductive when cleaning with a water gun, not only the bad fuel consumption of the air conditioner will also increase.

3. There is water in the pipeline.

There is a drying tank in the refrigeration system of automobile air conditioner, its task is to absorb the moisture in the refrigerant, when the desiccant in the drying tank is in a saturated state, the water can no longer be filtered out, when the refrigerant passes through the throttle hole of the expansion valve, the pressure and temperature factors decrease, and the water in the coolant will produce freezing phenomenon in the small hole, and cause the refrigerant to flow unsmoothly, and the resistance increases, resulting in the air conditioner can not be refrigerated.

What is the reason why car air conditioner is not cooling?

This may be due to the deterioration of the thermal insulation effect of the insulation film or the low thermal insulation of the applied film.

There are many brands of automotive window films on the market, which makes people overwhelmed, and the thermal insulation performance of different thermal separators is even more different. The quality of inferior film products is very unstable, often prone to decay, low heat insulation, after a period of use, there is almost only a layer of film without heat insulation, the temperature rise in the car can not quickly reduce the effect of the cold room in the car, the owner will feel that it is not as good as the air conditioning effect when just buying the car film.

1.The air conditioner is broken;

2.The air conditioner does not refrigerate due to a power outage;

3.The air conditioner is automatically identified and stopped by the thermostat.

The specific inspection methods are:

1.Check the compressor belt: if the belt is too loose, it should be adjusted, otherwise it is easy to make the air conditioning system poor refrigeration. Inspect the air conditioning system hose fittings for oil stains. If a leak is found, go to the maintenance office in time to solve it.

2.Clean the condenser: Because the surface of the car condenser is cleaned, it is easy to dissipate heat energy to the outside world. Regular cleaning of the condenser surface can greatly improve the cooling effect of the air conditioning system.

3.Check the refrigerant level height: Check the refrigerant level height.

The glass peephole is usually installed on the lid of the dryer to operate the motor and air conditioning system to observe the flow of refrigerant through the glass peephole. If the air conditioner is working properly, you can see through the peephole that the clear refrigerant is constantly flowing, and there are occasional small bubbles at high temperatures

1. The voltage is not enough. Voltage instability will have an impact on the cooling effect of the air conditioner, because when the voltage decreases, the power of the motor will decrease, which in turn will lead to poor cooling effect.

2. Do not clean and maintain the air conditioner for a long time. The radiator is the necessary place for air in the air conditioner, and dust and dirt will continue to accumulate on it; If there is too much dirt on the radiator, it will block the air outlet and affect the cooling effect.

3. Excessive room space, long-term frequent opening and closing of the door, long-term exposure to the sun, and frequent start and stop of the air conditioner will also affect the refrigeration effect of the air conditioner.

4. Lack of fluoride in air conditioners.

The amount of freon in the air conditioner is not enough, and when the air conditioner is used for refrigeration, the refrigeration of the air conditioner does not work.

1. The problem of refrigerant.

The system of automobile air conditioning is composed of multiple metal pipes, and there are small gaps between these pipes, so there is a slight leakage of refrigerant in the automobile air conditioning system. In addition, the desiccant in the automobile air conditioning system will absorb water and accumulate part of the refrigerant, so when the number of refrigerant is reduced to a certain extent, the refrigeration capacity of the automobile air conditioning will be reduced.

2. The filter screen of the filter is blocked.

Too much refrigerant and refrigeration oil in the automotive air conditioner will also make the filter screen of the filter blocked, resulting in the effect of refrigeration, the resistance will increase, and the refrigerant flowing to the expansion valve will also be reduced, resulting in the car air conditioner not being refrigerated. Sometimes, once air enters the automotive air conditioning system, the pressure of the refrigeration pipe will be too high, and the poor refrigerant circulation will also cause insufficient refrigeration.

3. The condenser is too dirty.

The condenser is mainly used to dissipate heat, but after a long time, it will lead to more and more dust on the condenser, resulting in poor heat dissipation and seriously affecting the refrigeration effect. There is also a filter that should also be cleaned, and if the filter is broken or has reached the end of its service life, it needs to be replaced with a new one.

Jetta air conditioner not refrigerating may be caused by the following 3 reasons, pay attention to check the following 3 aspects:

1. The water tank and condenser are not clean for a long time.

The water tank and condenser are important heat dissipation devices for vehicles, if they are too dirty, they will lead to poor heat dissipation, which will not only cause high engine temperature, but also have a direct impact on the refrigeration effect of the air conditioner. Therefore, when you feel that the use of air conditioning in hot weather is not ideal, the first thing to consider is whether the vehicle's cooling system has been cleaned.

2. There is too much dust in the air conditioner filter.

The function of the air conditioning filter is to block the dust outside the car from entering the car, and after a long period of use, the air conditioning filter will appear stolen, odorous, and even blocked. When the air conditioner filter is blocked with dust and foreign matter, it will seriously affect the air volume of the air conditioner, and then the air volume gear will be opened very high, and the noise is very large, but the actual air volume is very small, so the cold air blown out will be reduced a lot, affecting the refrigeration effect.

3. The blower is faulty or damaged.

The blower is the power source of the air conditioner, and if it has a problem, the air conditioner will not ventilate. As for whether the blower is damaged or not, after the owners turn on the air conditioner and turn on the maximum wind, they can listen to the location of the blower installed in the vehicle, whether there is any work in it, or the sound of something stuck in the blower.

When you have this kind of failure, the external unit is in a stopped state, at this time you can use your hands to feel whether the temperature of the outer chassis is too high. This kind of fault is generally due to the poor heat dissipation performance of the external unit and the improper installation position; The radiator is too dirty, the ventilation and heat dissipation are poor; The internal mesh is too dirty, and the system pressure is too high protection: 1. The power supply voltage is low, and the outdoor compressor of the air conditioner is not started, so the machine does not work in the refrigeration state, so it is still hot; 2. The mesh of the indoor unit is too dirty and not cleaned, resulting in too high pressure of the refrigeration system. 3. The room is large and the air conditioner is small, and there is no air conditioner with normal cooling capacity in proportion (such as a room of 30 square meters, you go to install a small machine, that is, 32 hang-ups), so the cooling capacity of refrigeration cannot meet the requirements, so the temperature cannot be lowered; 4. The air conditioner is installed with three points of quality and seven points, if there is a mistake in the installation of a good air conditioner, it is equivalent to not installing the air conditioner (such as the refrigerant leakage caused by the tightening of the connecting pipe of the internal and external units, the wrong connection line, etc.).

You can observe it by yourself first, or find a maintenance master to test it: first, measure the temperature difference between the air inlet and the air outlet, if the temperature difference is about (13-15) degrees Celsius, it means that the refrigeration is in good condition; Second, the state of the size of the shut-off valve of the outdoor unit, (the thick pipe is a low-pressure pipe, and the thin pipe is a high-pressure pipe) If there is condensation or dripping on the surface of the high-pressure pipe, it means that the refrigeration is good; If there is frost covering, it means that there is a lack of refrigerant and needs to be replenished in time; Whether the water outlet pipe of the inner machine is normal.

The normal working pressure of the refrigerant is about kilogram pressure (mainly related to the ambient temperature), if you have your own pressure gauge, you can connect it to the maintenance valve to test). Third, the temperature set by the air conditioner is not matched with the cooling degree of its own refrigeration, the minimum temperature is 16 degrees, if you set it to 16 degrees, it is not stopped, so that the external machine has been working, of course, it is a waste of electricity than when you set it at 25, and at least half of the electricity will be wasted. . . Fourth, temperature setting:

The temperature of the human body is adapted to summer: (24-28 degrees Celsius in winter: 20-24 degrees) It is best to set it within this range, which can effectively prevent the occurrence of air-conditioning disease, so that people can walk outdoors from the air-conditioned environment, so as not to cause dizziness due to inadaptability.

It is recommended that you find a professional maintenance personnel to repair it, although it saves money and trouble by doing it yourself, but many sequelae will also appear. ~

The solution to the car air conditioner is not cool:

1. The lack of refrigerant in the air conditioner leads to poor refrigeration effect or inability to refrigerate normally, and the owner needs to supplement the refrigerant for the vehicle. 2. The compressor of the vehicle is faulty, unable to work normally, and cannot produce cold air, because the main function of the compressor is refrigeration, and the owner needs to repair the compressor in time. 3. There is no maintenance of the air conditioner, resulting in the air conditioning filter and condenser are too dirty, and there is a blockage, which affects the refrigeration effect of the air conditioner, and the owner needs to clean the air conditioner in time and replace the new air conditioning filter.

4. There is a problem with the circuit of the vehicle, which cannot supply power to the air conditioning system, and the air conditioner cannot work normally, so the owner needs to check and repair the vehicle circuit in time. 5. The owner did not press the AC refrigeration switch, or adjusted the air volume too small, and did not set the function of the air conditioner, so that the air conditioner was not cool.

1. Too much refrigerant causes insufficient refrigeration.

Too much refrigerant is generally caused by overfilling the refrigerant during maintenance, because the proportion of refrigerant in the volume of the air conditioning system is required. If the proportion is too large, it will affect its heat dissipation, that is, the more heat dissipation, the greater the cooling capacity; Conversely, if the heat dissipation is less, the cooling capacity will be small. Similarly, if too much cooling oil is added during maintenance, the heat dissipation of the refrigeration system will also decrease.

2. Too little refrigerant causes insufficient refrigerant.

Most of the causes of refrigerant deficiency are due to small leaks of refrigerant in the system. If there is not enough refrigerant in the air conditioning system, the amount of refrigerant injected into the evaporator from the expansion valve must also be reduced, when the refrigerant evaporates in the evaporator. As a result, the amount of heat absorbed will decrease, and so will the cooling capacity.

3. The refrigerant and refrigeration oil contain too many impurities and micro-blockage, resulting in insufficient refrigeration capacity.

If there is too much refrigerant and refrigeration oil viscera in the whole air-conditioning system, the filter screen of the filter will inevitably be blocked, resulting in a decrease in the refrigeration passing capacity, an increase in resistance, and a relative decrease in the refrigerant flowing to the expansion valve, resulting in insufficient refrigeration capacity.

4. There is water infiltration in the air-conditioning and refrigeration system, resulting in insufficient refrigeration.

One of the main tasks of the refrigeration system is to absorb the water in the refrigerant to prevent the refrigerant from decreasing the refrigeration capacity due to excessive moisture in the refrigerant. But when the desiccant in the drying tank is in a state of moisture absorption saturation, the water can no longer be filtered out, when the refrigerant passes through the throttle hole of the expansion valve, due to the decrease of pressure and temperature factors, the water in the coolant will produce freezing phenomenon in the small holes, and cause the refrigerant to flow unsmoothly, the resistance increases, or can not flow at all.

5. There is air in the system.

Once air enters the air conditioning system, the pressure of the refrigeration pipe will be too high, and the poor refrigerant circulation will also cause insufficient refrigeration. Such failures are mainly caused by poor sealing of the refrigeration system, or incomplete evacuation during maintenance.

6. The compressor drive belt is too loose.

The drive belt of the air-conditioning compressor is loose, and the compressor will slip when working, causing the transmission efficiency to decrease, so that the speed of the compressor decreases, and the delivery of compressed refrigerant decreases, so as to directly reduce the refrigeration capacity of the air-conditioning system.

7. The heat dissipation capacity of the condenser decreases.

Due to the different working environment of the car, the surface of the condenser installed in front of the car engine will be covered with oil, mud or debris, so that its heat dissipation capacity will be reduced. In addition, the failure of the cooling fan, such as a loose drive belt, a drop in fan speed or a high fan speed, can lead to a decrease in the heat dissipation capacity of the condenser.

The car air conditioner is not refrigerated because the refrigerant in the air conditioning system is leaking, and the refrigerant is gone, so the air conditioner is not refrigerated. You can check whether some parts such as pipes, air conditioning pumps, condensers, and evaporation tanks in the air conditioning system are damaged and whether they have caused the leakage of refrigerant.