How to tell if the car air conditioner is normal

Turn on the air conditioner while the car is moving. Unless your engine is running, your air conditioner will not function properly. The optimal settings for diagnostics are:

First, set the fan speed to the highest setting and turn on the refrigeration switch. If your car has a Max AC setting, select that option.

Listen for unusual noises from the air conditioner. Noise may indicate that there is a problem with your compressor that needs to be repaired or replaced.

Feel the air coming out of the vents. You need to know if the air is cold or hot. Also note if it starts to cool and then warms, or if it starts to warm but intermittently cools.

Pay attention to the air pressure. Turn the air pressure to a high and low setting to see if the airflow changes as usual.

Smell the air coming from the vents. If there is an unusual smell, there may be a leak in the refrigerant fluid. You may also need to replace the cabin air filter.

Check your car's fuse. Check the car manual regarding the location of the car's fuse panel, as it may be under the hood, inside the trunk, or even in the driver's foot area. A blown fuse may cause the air conditioner to stop working.

Do not add refrigerant unless you are sure that low refrigerant is the cause of the problem, as too much refrigerant can overfill the refrigerant and cause serious damage.

1 Appropriate amount of refrigerant.

The refrigerant is seen through the sight glasses as transparent, non-cloudy, bubble-free, flowing smoothly, and comes out when the engine speed is increased or decreased.

A small amount of bubbles. When the refrigerant is appropriate, no matter how high or low the engine speed is, the refrigerant is transparent, and there are no oil stains on the pipe connection parts.

The high-pressure side (from the outlet of the compressor, the condenser, the reservoir dryer, and the inlet and outlet of the expansion valve) should be hot, and the temperature should be 50° 70.

There is a significant temperature difference between the high and low pressure sides; Indicates the right amount of refrigerant in the system.

2 Refrigerant leakage.

1) From the sight glass, you can see that bubbles appear every 1 2 seconds; There are oil stains on the connection part of the pipe; There is no significant temperature on the high and low pressure sides.

Difference. This indicates that there is a small leak of refrigerant in the system and needs to be replaced.

2) From the sight glass, you can see a continuous flow of turbid bubbles, or no bubbles but a mist of oil foam, or fog.

The bubble only flows with mist oil foam, and the pipe connection part is seriously polluted by oil: the temperature of the high and low pressure sides is basically the same, and there is no temperature difference. This indicates the department.

There is a serious leakage of refrigerant in the system, and there is almost no refrigerant in the system or all the refrigerant has been leaked, and the leak needs to be filled.

3 Refrigerant overdose.

When the fan is running at full load (all windows are open) or running no-load, air bubbles and pipe connections are always invisible from the sight glasses.

There are no oil traces, and there is a significant temperature difference between the high and low pressure sides, but it is abnormal. This indicates that there is an excess of refrigerant in the system, and more than refrigerant should be released from the low pressure side.

To judge whether the car's empty switch is normal, you can turn on the empty switch while the car is moving. Unless the engine is running, the air-jet zen will not work properly. or listen to the air for abnormal noises.

If not, the null adjustment is normal. Noise may indicate that there is a problem with your compressor and needs to be repaired or replaced.

Common faults and maintenance methods of automobile air conditioning.

1.Fault phenomenon: the compressor does not pull in, the air conditioning system does not work, and the system has no pressure.

Cause: All refrigerant leaks. Troubleshooting:

Find out the leakage point (pipeline wear, pipeline seal rupture, condenser pipe wear, pressure switch loose and not tightened, expansion valve damage and leakage, compressor safety plate damage and failure), and then replace the failed parts, and then vacuum the air, pressure holding, liquid filling refrigerant according to the charging amount specified by the air conditioning system, and the fault can be eliminated.

2.Fault phenomenon: compressor inhalation, air conditioning system is not cooled, the surface temperature of the compressor discharge pipe is very high (hot), there is no temperature difference between the inlet and outlet pipe of the open buried dust expansion valve, and the high pressure remains unchanged after the compressor is sucked in, but the low pressure is very low.

Reason: The temperature sensing head of the expansion valve is worn, and all the sealed refrigerant leaks out, resulting in the closure of the valve hole of the expansion valve and the inability to achieve refrigerant circulation. Troubleshooting:

Replace the expansion valve, then vacuum the air, maintain the pressure, add the refrigerant according to the charging amount specified by the air conditioning system, and the fault can be eliminated.

Millions of car purchase subsidies.

Cars are already a must-have tool for everyone to get around. Of course, automotive knowledge is essential. In order to facilitate everyone to understand these knowledge, today Bian Xiao will introduce to you how to judge whether the car air conditioner is normal.

Interested friends can learn about it, it may be helpful to you.

Turn on the air conditioner while the car is moving. Unless your engine is running, the air conditioner won't work properly. The optimal settings for diagnostics are:

First, turn the fan speed to the highest and turn on the refrigeration switch. If there is no noise, the air pressure and airflow are basically normal, indicating that the air conditioner is normal. Frequently encountered problems and maintenance methods of automobile air conditioners.

1.Problem phenomenon: the compressor is not turned off, the air conditioning system is not working, and the system is under no pressure.

Cause: All refrigerant leaks. Method:

Find out the leakage point (pipe wear, pipe seal rupture, condenser pipe wear, pressure switch loose and not tightened, expansion valve damage leakage, compressor fuse damage and failure), then replace the faulty parts, then vacuum, pressure maintenance, refrigerant according to the specified filling amount of the air conditioning system, the problem can be discharged. 2.Problem Symptom:

The compressor is sucked in, the empty car is not refrigerated, the surface temperature of the compressor exhaust pipe is very high (hot), and there is no temperature difference between the surface temperature of the inlet and outlet pipes of the expansion valve. After the compressor is sucked in, the high pressure remains unchanged and the low pressure is very low. Reason:

The temperature sensing head of the expansion valve is worn, and all the sealed refrigerant leaks, so that the valve hole of the expansion valve is closed, and the refrigerant circulation cannot be realized. Method: Replace the expansion valve, then vacuum, maintain the pressure, fill the refrigerant according to the filling amount specified by the air conditioning system, and the problem can be discharged.

There are generally two kinds of fault detection methods for automobile air adjustment, one is the visual inspection method, the other is the equipment detection method, and the two methods are used together in the general maintenance air adjustment, which can better judge the specific cause of the failure of automobile air adjustment. Let's show you how to visually inspect a car for an empty fault.

1.Check the air volume of the vacant air outlet. If the air output is insufficient, check the filter element of the empty air filter to remove any impurities.

2.Listen for any abnormal noise near the compressor, and if so, check the installation of the compressor.

3.Check the condenser fins for smiling dirt and remove dirt if there is.

4.Inspect the joints of the refrigeration circulation system for oil stains. If there is an oil stain, it means there is a leak. Tighten the joints or replace the parts. Touching the New Year's Sales.

5.Turn on the fan to low, medium and high gears, listen to whether the fan is noisy, and check whether the fan is working normally. If there is noise or abnormal operation, the blower should be replaced (foreign objects or blower installation problems can also cause noise or abnormal operation, so it should be carefully inspected before replacement).

6.Check the amount of refrigerant through the viewing window.

Millions of car purchase subsidies.

The biggest problem of car air conditioning is similar to that of home air conditioning, either it does not cool down, the cooling effect is not good, or there is a peculiar smell. In order to enjoy the cool cold breeze in the hot summer, it is necessary to systematically check the air conditioning of the car before the summer season, mainly the air conditioning compressor, refrigerant and air conditioning hose.

Why the car is empty and not cooled:

1.Lack of refrigerant. The loss of refrigerant is mainly leakage. If the car has a bad adjustment in time, the refrigerant will start to deteriorate after a period of time, which may be a condenser leak.

2.The condenser is too dirty. This can lead to high engine temperatures or poor air conditioning. When cleaning, be sure to blow it clean with a spray gun first.

3.There is water in the pipes. In the refrigeration system of the automotive air regulations, there is a drying tank whose task is to absorb moisture from the refrigerant.

When the desiccant in the drying tank is saturated, the water can no longer be filtered out, and the moisture in the coolant will freeze in the pores, resulting in poor refrigerant circulation and increased resistance, resulting in air conditioning that cannot be cooled.

4.The compressor capacitor is damaged or defective, causing the compressor to not work.

Millions of car purchase subsidies.

The editor-in-chief said that many friends do not know much about car knowledge. In order to make it easier for you to understand this knowledge, today we will introduce to you how the editor-in-chief can test the automotive air conditioning system. The function of the automotive air conditioning system is to provide a comfortable riding environment for the occupants, reduce the fatigue intensity of the driver, and improve safe driving.

In order to enjoy the cool breeze on a hot day, you need to check your car's air conditioner before summer. The inspection items include refrigerant circulation, air conditioning hoses, hose fittings, compressor belts, etc. The details are as follows:

1.Detection of refrigerant circulationFrom the window of the dry tank, the refrigerant circulation status can be detected at the same time, and the refrigerant dosage in the system can be roughly detected. Start the engine, turn on the air conditioning system, rotate the engine at high idle speed (1500 kl min) for 5 minutes, and observe the drying tank window.

If the liquid flows normally, the circulation is normal; If the liquid does not flow, the tightness of the system should be checked and repaired; When there are bubbles, it means that the refrigerant is insufficient, and the system must be tested and repaired, and a suitable refrigerant must be added. If there are milky white bubbles, it means that the humidity of the refrigeration system is too high. 2. After testing the air conditioner hoses, hose joints, and compressor belts that are temporarily not used with the air conditioner, the first use of the air conditioner after the change of seasons may find that the air conditioner is not cooled. In this case, the air conditioning hose and fittings need to be inspected.

The air conditioner hose is aging and needs to be replaced if there is a leak, and the hose fitting needs to be tightened if it is loose. The compressor is the basic of the air conditioner, and all refrigerators are as basic as household air conditioners and refrigerators, and the compressor is very good. If the belt of the compressor becomes loose due to long-term use, it will be related to the normal operation of the air conditioning system.