Common symptom 1: The cooling effect is not ideal.
Generally speaking, when the doors and windows of the car are well sealed and the car body is well insulated, after the air conditioner runs at the engine speed of 1000 rpm for 30 minutes, the temperature difference between the inside and outside of the car is 10 or above, and it can be judged that the effect is ideal if it is lower than 10.
1. Freon pipeline is blocked or Freon is insufficient;
The temperature in the engine room has a certain influence on the management of freon, and some small sundries will also block or corrode the pipe body, usually in the liquid storage tank or expansion valve; It is suggested to go to the repair shop to clean the pipeline blocked by freon and vacuum again. The freon in the pipeline will lead to insufficient refrigeration because of long-term unfilled, pipeline leakage and air mixing; Supplement or vacuum leak detection, and refill refrigerant and compressor oil with standard pressure after maintenance.
2. The compressor doesn't work, and the condenser has poor heat dissipation;
If the compressor can't run due to abnormal cold coal pressure, line fault, temperature sensor damage or compressor electromagnetic clutch burning, the refrigeration is insufficient and the temperature sensor or electromagnetic clutch needs to be replaced; The cooling effect of the cooler is not good, such as the auxiliary fan is not running, and there is dust and dirt on the radiator of the cooler, which will make the refrigerant liquefy badly and reduce the refrigeration capacity. When washing the car, you can use high-pressure water to flush the radiator from the front of the car at the forward grille. If the fan does not rotate, replace the small fan and clean the condenser if necessary.
3. The air filter is blocked:
The blockage of the air filter screen causes the wind blown out of the air outlet to be too small, which affects the air output and the refrigeration is not enough; The air conditioning filter element can be replaced.
Common symptom 2: There is noise or abnormal sound inside the air conditioner compressor.
1. compressor equipment sound:
There is a loud noise during operation, indicating that the compressor may be worn due to the lack of refrigeration oil in the pipeline, and it is generally necessary to replace the compressor body.
2. Belt noise:
The belt driving the compressor is not tight enough, and it slips after the compressor engages the load, resulting in a sharp whine; Improvement of the transmission belt that can be tensioned or replaced.
3. Fan noise:
The motor bearing of the fan is worn, which will increase the noise with the increase of the speed. Replace the fan or lubricate the blower bearing.
4. Wind direction and hot water valve:
The hot water valve for controlling the engine cooling water to flow into the heat exchanger and the flap valve for controlling the wind direction will sound when working. If it's not serious, you can leave it alone or go to a repair shop for maintenance.
Common symptom 3: air conditioning odor.
When it rains or after the air conditioner has not been used for a period of time, it will smell when the air conditioner is turned on. The air conditioning system is the part where bacteria and mold gather in the car, and mold will blow directly into the car with the air outlet of the air conditioner to pollute the indoor air, especially in rainy days in summer.
When the hot car is turned on, the hot air with the highest air conditioning temperature blows in all directions and remains relatively dry. When the air conditioning filter element is wet, replace the filter element and disinfect the external circulation air duct with cleaning agent.
Common symptom 4:
The air conditioning system is broken. Turn on the air conditioner switch, and the indicator light shows that the air conditioner does not actually work or there is no response after turning on the air conditioner switch. Check whether the fuse and harness connector of the electric cabinet are in good condition, turn on the switch and stop working, and check whether the condensing fan works normally. If the harness connector of the electric cabinet fuse is loose, it should be tightened in time. If it is damaged, it needs to be replaced. If the refrigerant is too much or too little, it should be increased or decreased in time. The problem of condenser is best solved in the repair shop.
In addition, it is also important to pay attention to the use and maintenance of air conditioners:
1, before seasonal use, check the surface cleanliness of condenser and evaporator. If there is a lot of dust, it should be removed and blown clean with compressed air. At the same time, check whether the performance of control elements and switches is good.
2. When the car is driving at low speed, the wind speed switch should be set at low speed. During normal operation, the temperature control switch should be kept at the lowest position for a long time to prevent the evaporator from frosting excessively. At the same time, do not switch the air conditioner frequently to prevent the air conditioning system from being damaged.
3, every two or three weeks should check the compressor lubricating oil level height, also should check the amount of refrigerant, insufficient should be added. Check the tightness of the drive belt of compressor and fan and its aging degree about once a month. If you find a problem, you must eliminate it.
4, the use of air conditioning will make the cooling system temperature higher than normal. Because the application of air conditioning increases the extra load of the cooling system, if the car stops for a long time, it can increase the engine speed to help cool down; However, it should not be too long to stop using the air conditioner, so as to avoid damaging the refrigeration system due to the high condensation pressure of the radiator.
5, air conditioning should be turned on once a week or so, let it run for a few minutes, so that the refrigeration system cycle. Compressors and seals should be fully lubricated to maintain a good technical condition.
6. When using the air conditioner, the system must be kept clean, especially the dust in the condenser and evaporator fins should be removed regularly to maintain good heat dissipation effect.
I believe that after the owner's usual use and careful maintenance of the air conditioner, the air conditioner will be used more and more smoothly!