Why does the air conditioner in the car blow hot air and cold air for a while?

The probable cause is the phenomenon of the compressor protection device tripping. Blow hot air when jumping.

After the compressor is restarted, a cold air is blown.

Compressor overload protection will trip, indicating that the system is too high-pressure, the pressure is too high, or the overheating current is too high.

Causes and elimination of high pressure and overheating:

1. Refrigerant.

Plethora. Reduce the refrigeration dose appropriately.

2. Poor heat dissipation. Check the condenser pipe for dirt and dirt and clean the condenser.

3. The pipeline system is blocked. Refer to the pressure gauge.

Judgment, exclusion, and re-systematic processing.

4. Dust and fouling of the evaporator or filter screen. The airflow becomes smaller, the system pressure and temperature are unstable, and the evaporator or filter is cleaned.

5. Fluoride deficiency is also possible. When there is a lack of fluorine, the compressor discharge temperature will overheat, causing the overheating load protection switch to trip.

The electrical problem is:

1. Control circuit board failure.

2. The temperature sensor is overloaded and the information is wrong.

3. The power supply wiring is loose and the contact is poor.

4. The starting capacitor or compressor starting coil is burned out.

The information is insufficient, it can only be analyzed in this way, and there are many other possibilities, it is recommended to find a professional maintenance personnel to check it.

If this problem occurs, then it is likely that the inverter compressor is malfunctioning. When the inverter compressor fails, it will show the phenomenon of alternating cold and hot blowing. At this time you need to repair him.

The problem of blowing hot and cold air in the air conditioner in the car is very simple, because this can be controlled by humans, and the person can set him to blow hot air, and he will blow hot air, and let it blow cold air, and he will blow cold air.

There is a problem with the voltage.

There is a serious lack of fluoride in air conditioners.

Four-way valve failure and computer board failure can cause non-refrigeration.

Because the heating and refrigeration system of automobile air conditioning is two unrelated parts, so the air conditioner only produces hot air and does not produce cold air, which is obviously a problem with the refrigeration system, or caused by misoperation, the user should check whether the external circulation is opened, if the external circulation is opened while refrigerating, then the refrigeration effect is of course not obvious, giving people a feeling of blowing hot air.

Lack of refrigerant in car air conditioner: The car needs to add refrigerant once every 2-3 years, or judge whether it needs to be filled with refrigerant according to the refrigeration effect of the car. Although there is natural loss of refrigerant, the leakage of air conditioning pipeline or condenser is the main cause of accelerated refrigerant loss.

Since the filling of refrigerant requires the use of professional tools and equipment, it is recommended that the owner go to a 4S shop or repair shop for processing.

Air conditioner compressor belt is too loose: The compressor is the heart of the air conditioning system, and the transmission belt is too loose, which can easily lead to the slippage of the electromagnetic clutch, and at the same time lead to a decrease in transmission efficiency, resulting in the air conditioner not being refrigerated. The belt can be adjusted, and if the belt still has aging cracks and other losses, it should be replaced with a new transmission belt.

Hello, it may be a lack of fluoride, it is recommended that you go to a professional electrician repair shop to check and repair, generally fluoride is about 150-200, I hope what I said will be of some help to you [car problems, ask the car master. 4S shop professional technician, 10 minutes to solve. 】

The engine system is overheated, preventing coolant from flowing back to the air outlet and thus preventing refrigeration. You can go to the general maintenance point to have a look.

In the case of automatic air conditioning, when the outside temperature is higher than the temperature inside the car, the heater is blown. Or if you set the temperature higher than the outside temperature on the day, it will also blow warm air.

Turn off the dual-zone temperature control, turn on a c, adjust to 22 or 20 degrees, and the air conditioner can be cooled.

Hello, according to what you said, it should be that the refrigerant (freon) is insufficient, it is recommended to go to the maintenance agency to test the pressure of the air conditioner, and then consider whether the refrigerant is insufficient or the compressor is faulty, if the refrigerant is insufficient, it is recommended to add fluorescent agent for side leakage. If the compressor fails, repair the compressor! [Car questions, ask the car master.]

4S shop professional technician, 10 minutes to solve. 】

Do you see if the flap of your hot and cold air switch is broken, and the top is turned over to the bottom of the cold air? My car is.

You have to go to a professional repair shop or 4S shop to test this, it may be that the air conditioner start switch is broken, and it will be turned on and closed for a while.

It may be that the temperature of your car air conditioner is unstable, and then you go to the car factory to do a specific inspection and repair.

It shouldn't be like this, you check if it's on the outer loop.

This is a professional knowledge, and it is possible that the air conditioner start switch is broken.

Hello: The car is placed in the outside environment in summer, the temperature in the cockpit is very high, as soon as you get in the car and go in, the air conditioner does not work, the temperature is too high to seventy or eighty degrees, what should I do?

Step 1: Four doors open, inside is the greenhouse effect, and the temperature drops down quickly after opening the door;

Step 2: Enter the cab to turn on the air conditioner, do not press AC to refrigerate first, open the external circulation first, and discharge the air in the cockpit through the rear air outlet; The temperature of the outside air is nearly equal to that of the air in the cockpit;

Step 3: Turn on the air conditioner, press the A C button, switch to the inner circulation, and adjust the air outlet (preferably blowing on the face) and temperature (cooling direction).

In the beginning, after all, the weather was too hot, so it was hot air at first, and after a while, it would become cold wind.

This is because the car has just started and is running quickly, so the air conditioner is blowing hot air. After about 5 minutes, a cool breeze will blow.

Because the refrigerant has not yet had an effect after the air conditioner is turned on at the beginning, the air that blows out at first is hot air.

The main reason is that the cooling of the air conditioner does not work instantaneously, and the air conditioner needs to work for a few seconds before cold air is generated.

There is always a buffering process. And the temperature in summer is very high, so it is very normal to blow hot air at the first time when the air conditioner is turned on.

1、Forgot to press the "AC" key:

AC is the refrigeration button of the air conditioner, and only when it is pressed, the air conditioning compressor will start working; If you forget to press the AC button, the compressor will not work, and naturally there will be no cold air, and turning on the air conditioner is not as simple as turning on the blower block and adjusting the hot and cold knobs to the cold zone.

2. Overheating protection of automobile air conditioning compressor:

This situation mostly occurs when the refrigeration suddenly stops refrigeration for a period of time and blows hot air. Compressor overheating protection is to protect the refrigeration circulation system of the air conditioner, when the temperature of the compressor casing rises abnormally, like more than 150, the thermal protection switch on the compressor is disconnected, so that the compressor stops working.

Note: Although there are many types of vehicles, the structure is similar. This should be said to be the credit of standardization, but also the need for large-scale production lines. With the development of society, the progress of science and technology and the change of demand, the shape of railway vehicles has begun to change, especially the passenger car is no longer the same old face.

However, their basic structure has not changed significantly, but the specific parts have a more scientific and advanced structural design.

Generally speaking, the basic structure of the vehicle is composed of five parts: the car body, the undercarriage, the running part, the coupler buffer device and the braking device. The body is the part of the vehicle that is used to load goods or passengers, and is the basis for the installation and connection of other components of the vehicle. The body of the early vehicles was mainly made of wood, supplemented by steel plates, bow rods, etc.

In modern times, the car body is mainly steel structure or light metal structure.

Maybe the baffle of the air conditioner outlet is broken... The hot air of the engine is blowing together... Dismantle the central control and take a look at it. . .

AC opens.

Open the inner circulation. If you don't have a cool breeze, you have to get tested.

Compressor refrigerant 134a.

High and low pressure in the pipeline.

Car air conditioner is hot air mainly for the following reasons:

1. First of all, see if the air conditioner is turned on the refrigeration mode, if the refrigeration is not turned on, there is no cold air coming out, and the refrigeration switch of the car air conditioner is AC.

2. Check whether the external circulation is enabled.

Turning on the air conditioner while opening the external circulation is undoubtedly to lead the heat outside the car to the car, and the refrigeration effect of the air conditioner will naturally deteriorate, so when the weather is hot, it is necessary to adjust it back to the internal circulation as soon as possible after the external circulation ventilation.

3. Check whether the car air conditioning system is missing refrigerant.

If your car has been purchased for two or three years, and then found that the air conditioner is not refrigerated or cold enough during use, it is very likely that there is no refrigerant, and the loss of general refrigerant is caused by leakage, but this is divided into fault leakage and normal leakage, under normal circumstances, the air conditioning pipeline or condenser has a slight leakage, so the refrigerant basically needs to be re-added in two or three years.

The cheerful front in the car air conditioner is much more than the air coming out of the hot air, mainly because the car air conditioner is not turned off.

Maybe the refrigeration system is broken.

The reason why the air conditioner blows hot air and cold air while blowing cold air is that the temperature in the car is regulated by the intake air volume of hot and cold air.

An air conditioner is an air conditioner. It refers to the equipment that uses artificial means to regulate and control the temperature, humidity, flow rate and other parameters of the ambient air in the building or structure.

Generally, it includes cold source heat source equipment, cold and hot medium transmission and distribution system, terminal device and other major parts and other auxiliary equipment. It mainly includes refrigeration hosts, pumps, fans and piping systems. The terminal device is responsible for using the cold and heat from the transmission and distribution to specifically treat the air state and make the air parameters of the target environment meet certain requirements.

Air conditioning is an indispensable part of modern life, air conditioning provides people with coolness, but at the same time, air conditioning is always on is also easy to cause diseases, such as "air conditioning disease", etc., need to be used with caution.

Around 1700 B.C., the Babylonians had invented an ancient air-conditioning system, which used a wind pole installed on the roof to blow the natural wind from the outside through the cool water and into the room, so that the people inside felt cool.

In the 19th century, Michael Faraday, a British scientist and inventor, discovered that compressing and liquefiing a gas can freeze air, a phenomenon that occurs when liquefied ammonia evaporates, and his idea was still theoretical.

In 1842, Florida physician John Gorrie completed a new building with air conditioning. Alfred Wolff, an engineer from Hoboken, New Jersey, who helped design the new air-conditioning system and moved the technology from a textile mill to a commercial building, is considered one of the pioneers in making the work environment cooler.

In this case, it is ruled out whether the vehicle is equipped with zonal air conditioning and adjusts the heat while cooling it, if not, it may have a windshield problem or a control program problem.

For models with zonal air conditioning, it is normal for the temperature setting of zonal air conditioning to be inconsistent and there is a situation of cold air and hot air at the same time. If the vehicle is not equipped with zonal air conditioning, this situation is mostly caused by insufficient air conditioning refrigeration.

The situation that causes the air outlet to produce hot air while emitting cold air is generally caused by the poor closure of the cold and warm diversion baffles.

1. The temperature setting is high and low on one side;

Dual-zone air conditioner is the main cab and passenger cab need to adjust the temperature, if one side is low, it may cause one hot and cold at the same time.

2. The hot and cold knobs are not adjusted correctly;

For example, if you want to get hot air and the knob doesn't get red, you want to get cold air and the knob doesn't get blue.

3. Not enough refrigerant or too much refrigerant.

4. The heating valve is blocked;

Automatic zonal air conditioner is two water pipes into the warm water tank, if one is blocked and the other is not blocked, the temperature will be different, and the temperature of the air outlet will be different.

5. The stepper motor is damaged.

6. The air conditioner computer is malfunctioning;

The reasons for the cold air and hot air on the side of the car air conditioner: 1. The temperature setting is high and low on the other: the dual-zone air conditioner needs to adjust the temperature of the main cab and the passenger cab, if it is low on one side, it may cause it to be hot and cold at the same time; 2. Heating valve is blocked

Automatic partition air conditioner is two water pipes into the warm water tank, if one is blocked and the other is not blocked, the temperature will be different;

The refrigeration of the air conditioner in the car is based on the evaporator as the main component of heat exchange, and the air is sent to each air outlet through the air duct after being cooled by the evaporator. If there is a hot air and cold air on one side, it means that there is a maximum possibility of thermal insulation damage or leakage in the air duct, which needs to be repaired before the cold air can be produced normally, otherwise it will affect the cooling effect in your car.

The temperature setting is high and low: the temperature of the dual-zone air conditioner needs to be adjusted in the main cab and the passenger cab, if it is low on one side, it may cause it to be hot and cold at the same time; Heating valve blockage: Automatic partition air conditioner is two water pipes into the heating tank, if one is blocked and one is not blocked, the temperature will be different, and then check the compressor, the compressor to see if there is a problem.

The air conditioner is not set correctly or is damaged. Judging whether the air conditioning system is working well is actually very simple, if you find that the air conditioner has poor refrigeration, low air volume, or simply does not refrigerate, etc., you need to check whether each component is operating normally and whether there is a lack of condensate.