Car air conditioners are normal for everything, and they need to be refrigerated at high speeds

There should be a problem with the compressor.

Generally, the common causes of air conditioning not refrigeration are: insufficient refrigerant, expansion valve blockage or evaporator plate blockage, condenser plate blockage or system temperature is too high, poor refrigeration effect, air conditioning system pipeline leakage, air conditioning compressor pressure is insufficient, air conditioning fuse burning, line damage, short circuit, or poor connector.

The solutions are as follows:

1) Strengthen the maintenance of the components of the air conditioning system, and pay attention to the cleaning of the surface of the condenser sheet to ensure the heat dissipation effect;

2) Detect the system pressure to confirm whether the refrigerant filling amount and pipeline are unblocked;

3) Check whether the fuse and connector are working well.

Detection method. Fault judgment and maintenance of car air conditioner is not refrigerated or insufficient air conditioning is a common fault of air conditioner, the basic maintenance method can be mastered by general maintenance workers, both from the easy part, through the eyes and ears to find the cause or part, we call it sensory inspection method, and another detection method - instrument detection method, easy to be ignored, the method can often help us to find the cause of the fault accurately and quickly.

Check whether the high and low pressure of the refrigerant at high speed meets the requirements, if the refrigerant is excessive, resulting in too high pressure at high speed, resulting in the pressure switch on the high pressure side to protect and disconnect the electromagnetic clutch, the air conditioner will not be refrigerated.

Check whether the belt of the compressor is loose, there is a transmission at low speed, and it may slip at high speed and cannot control the cold !!

Car owners often encounter such a problem, the air conditioner is in a normal state when idling or driving at low speed, once the speed is accelerated, the air conditioner is not refrigerated, and the temperature of the air outlet rises significantly. According to common sense, the air conditioning compressor has a higher speed and more refrigeration power when driving at high speeds, and the front airflow can also help the condenser dissipate heat, and the refrigeration effect should be better. What is the reason for not cooling at high speeds?

The arrows are called expansion valves. The compressed high-pressure refrigerant from the compressor enters the evaporation tank through the expansion valve through the thin tube on the right side, and the evaporative endothermic temperature is generated. The gaseous refrigerant enters the compressor from the coarse tube on the left side for the next cycle.

When the expansion valve is blocked, the refrigerant compressed by the compressor cannot flow and collects here.

Because the expansion valve is clogged mostly because there is moisture in the refrigerant, the refrigerant from the compressor enters the evaporation tank through the small hole on the left side, which is very narrow. When driving at low speeds, the refrigeration power of the compressor is low, the temperature of the expansion valve is not too low, and the moisture can enter the evaporation tank with the refrigerant. However, during high-speed driving, when the speed of the compressor increases and the refrigeration power increases, the temperature at the expansion valve is very low.

If something goes wrong with the self-adjusting function of the expansion valve, the water can easily freeze and clog the small holes of the expansion valve, causing the system pressure to rise. In some cars, when the speed reaches 60kmh, the expansion valve will be blocked, while in others, when the speed is close to 100, this is normal, because the refrigeration power of the compressor is only related to the engine speed, the higher the engine speed, the greater the refrigeration power.

You can step on the accelerator on the spot to increase the engine speed. After the compressor is stopped, the expansion valve is filled with hot water. If the compressor restarts after pouring hot water, it can be determined that the expansion valve is a problem.

The solution is to replace the expansion valve first and at the same time check the drying tank of the refrigeration system. If the drying tank fails, it should be replaced together, otherwise it is easy to recur after the drying tank loses its moisture absorption capacity. After replacement, the refrigerant is injected after strict vacuuming.

Compressors are divided into constant displacement compressors and variable displacement compressors. A constant displacement compressor means that the displacement of each duty cycle is constant and the amount of refrigerant being compressed is constant. The displacement of a variable displacement compressor is not fixed, but variable.

The working process of a constant displacement compressor is that when the AC switch is not turned on, the compressor does not work. Although the belt of the engine always drives the pulley of the compressor to rotate, it only idles, the piston inside the compressor does not work, and the refrigerant is not compressed. There is an electromagnetic clutch in the pulley.

When the air conditioner switch is turned on, the electromagnetic clutch is engaged. At this point, the power of the compressor pulley can be transferred to the piston in the compressor to start working and cooling. Variable displacement compressors do not have an electromagnetic clutch and the pulley is constantly turning.

It works and doesn't work by adjusting the displacement. When the displacement is almost zero, it no longer works, which is equivalent to the idling of the pulley.

The effect of air conditioning refrigeration has nothing to do with the speed of the car, because the cooling effect of the car air conditioner depends on the output power of the engine and the working intensity of the compressor. So put it this way.

It does not matter. The two things are not related, and the mechanics are different, and the things used are not the same.

1. The refrigeration of automobile air conditioning is driven by engine power to start the refrigerator, which is the same as the principle of household air conditioning refrigeration, except that the automobile air conditioning system has an additional air supply system, which distributes the cold air to various positions inside the car, similar to the air supply mode of the first air conditioner.

2. The heating of automobile air conditioner is generally realized by using the engine water tank radiator to provide ground heat. There is no need to start the on-board air conditioning system.

The slow refrigeration speed of automobile air conditioner is the reason why the air conditioning compressor lacks refrigerant.

Automobile air conditioning is driven by the engine leakage base, the speed of the engine affects the running speed of the air conditioning compressor, and when the refrigeration dose in the compressor is small, the refrigeration effect of the air conditioner will appear at high speed.

If it is only refrigerated when it is running at high speed, Li Hui may have a problem. The most common is the lack of refrigerant. It could also be that the belt is slippery or loose. Hope.

How to solve this problem if the engine speed does not change when the vehicle air conditioner is turned on?

1.It doesn't have to be a glitch. In general, when the air conditioner is turned on, the engine speed will increase.

This is to meet the load requirements of the air conditioning compressor and keep the engine idle stable. However, many new cars with engines do not increase the engine speed when the air conditioning is turned on, but rely on increasing the injection time of the engine injectors to keep the engine idle stable. Therefore, the engine not accelerating when the air conditioner is turned on is not necessarily a fault.

When the air conditioner is turned on, the engine speed does not change. Most people think that the load on the air conditioning engine will increase, and then the speed will increase. If the speed does not change, I don't know if the tachometer or the compressor is broken.

2.In fact, the power that is transferred from the engine of some cars to the air conditioning compressor is not by increasing the rpm, but by increasing the injection time of the engine injector to keep the power and idle stable. So it is normal for the speed to remain unchanged after turning on the air conditioner.

Fourth, many car owners think that the blackening of the engine oil is a problem with the engine oil or the oil filter, but it is not. There are generally two types of engine oil blackening, one is to add dish soap dispersant, and the black substance is the dish soap dispersant to absorb carbon deposits and oil oxides to keep the engine and metal surfaces clean, which is a normal phenomenon. The other is that if you don't add dish soap and dispersant to the car, most of the oil will be oxidized, and there is something wrong with the oil.

3.Generally, the engine speed of vehicles with air-conditioned rooms is increased to meet the load requirements of the air-conditioning compressor and keep the engine idle stable. However, some vehicles rely on increasing the injection time of the engine injectors to keep the engine idle stable.

The air volume of the air conditioning outlet is smaller, and the air volume of the air outlet in the car will gradually decrease with the use of the vehicle at the same fan speed, and the cooling effect will also be weakened. This is because the vehicle is equipped with an air conditioning filter, which will be covered with dust after a period of use, resulting in a decrease in the air permeability of Xiaolai and a change in air volume.

This problem does not need to be solved, because the engine does not increase the speed when the air conditioner is turned on, it is maintained by increasing the injection time of the engine injectors.

Perform the treatment through training, or solve the environment with uneven speed of the machine, or send it to the repair shop to solve such a result.

Solve the problem by repairing, or understand the uneven engine speed, and solve it in the repair shop.

If you solve the problem by repairing it, or if you know the uneven engine speed, you can send it to the repair shop to solve such a problem.

In such a situation, you must drive the car to the 4S shop for maintenance in time, and then you should also check whether the engine is faulty, and if there is a fault, you must replace and repair it in time.

This achievement does not need to be solved, because when the air conditioner is turned on, the base of the planner will not increase the speed, and it is maintained by increasing the fuel injection time of the planner injector.

The heat dissipation is not good, the refrigerant is not enough, and there is a problem with the pressure sensor.

Lack of fluorine, the air conditioning filter is dirty, and the internal circulation is not opened!

You can write an article about the reasons why the refrigeration effect is not good. If your air conditioner has been used for several years, it is recommended to add some fluoride. Direct fluoride. Otherwise, you see that the maintenance personnel will have to slaughter you, if the effect is still not good after adding fluoride, it is recommended to have to pay for maintenance.

Summary. Hello, I am your exclusive service technician, attentive, attentive and careful to help you solve the problem of car use car air conditioner everything is normal, only when the high speed can be refrigerated, this situation is generally poor heat dissipation. The cause of poor heat dissipation, first check the surface of the condenser to see if there is any dirt, and whether the heat sink has been tipped, resulting in poor heat dissipation.

The second aspect is to consider whether there is a blockage inside the air conditioner, resulting in poor heat dissipation.

Car air conditioner everything is normal, why do you need to refrigerate at high speeds?

Hello, this question can give you a perfect reply, wait for me to sort out the information, I'm typing, 2-3 minutes, don't finish.

Hello, I am your exclusive service technician, concentrated, with the pat, carefully help you solve the car problem and car air conditioning everything is normal, only when the speed can be cooled, this situation is generally poor heat dissipation. The cause of poor heat dissipation, first check the surface of the condenser to see if there is any dirt, and whether the heat sink has been tipped, resulting in poor heat dissipation. The second aspect is to consider whether there is a blockage inside the air conditioner, resulting in poor heat dissipation.

If the speed is too high, the pressure of the high-pressure pipe will be too high, which will trigger the condition of the shutdown protection of the automobile air conditioning compressor, and it will stop working.

The air conditioning compressor plays the role of compressing and driving the refrigerant in the air conditioning refrigerant circuit. Air conditioning compressors are generally installed in outdoor units. The air-conditioning compressor extracts the refrigerant from the low-pressure pressure area and sends it to the high-pressure area for cooling and condensation after compression, and dissipates heat into the air through the heat sink, and the refrigerant also changes from gaseous to liquid, and the pressure increases.

It is normal for the idle speed of the air conditioner to rise. The role of the vacuum solenoid valve in the air conditioner is to turn on the electromagnetic clutch circuit at the same time, the solenoid coil of the vacuum transfer valve is also connected, and the vacuum transfer valve increases the throttle opening of the carburetor through the lever, so that the idle speed increases. Under normal circumstances, almost all vehicles will have an increase in idle speed when the air conditioning is on, and it is normal to increase it by 100 to 150rpm.

It is normal for the air conditioner to idle high. The role of the vacuum solenoid valve in the air conditioner is to turn on the electromagnetic clutch circuit at the same time, the solenoid coil of the vacuum transfer valve is also connected, and the vacuum transfer valve increases the throttle opening of the carburetor through the lever, so that the idle speed increases.

Under normal circumstances, almost all vehicles will have an increase in idle speed when the air conditioning is on, and it is normal to increase it by 100 to 150rpm. When the air conditioner is turned on, the air conditioner compressor is driven by the air conditioner compressor belt, and the belt drive force comes from the engine. Therefore, in order to ensure that the idle speed will not be stalled due to additional engine load in the idle state, the idle speed of the vehicle with EFI control and belt drive air conditioning compressor will increase.

EFI engines all have an engine control unit that controls and adjusts the appropriate idle speed to keep the engine running in a low-power state and not being extinguished. If the idle speed is unstable only when the air conditioner is turned on, there are the following reasons:

1. The engine control logic is wrong, and the signal of the air conditioner cannot be received. When it is not possible to determine whether the air conditioning is turned on or not, the engine control unit (ECU) mistakenly thinks it is a short period of high load in an attempt to increase the rpm to offset the drag at idle. When the engine speed drops, it cannot bear the load of the air conditioning compressor and increases the speed again.

The back and forth of the manuscript spine is manifested as unstable idling.

2. The air conditioner control circuit is wrong and the air conditioner cannot be turned on. Because it is impossible to determine the state of the air conditioner when it is turned on, the ECU will continuously adjust the idle speed, which will behave as an unstable idle speed.

3. The air conditioner circuit is faulty, resulting in the intermittent work of the air conditioner. When the air conditioner is not working, the air conditioner compressor belt is idling and no-load state, so it will not affect the engine load. The continuous intermittent operation of the air conditioning compressor causes the engine to continuously adjust the idle speed, which is manifested as unstable idling.