Car Maintenance Class——Properly maintain the air-conditioning system to keep your car cool for the summer!

The weather is hot and there are more and more sauna days. If the car’s air conditioner breaks down at this time, the car will be as unbearable as a steamer. Looking at the car air-conditioning problem, it seems simple, but it has not been repaired after repeated inspections and repairs. What is the problem? Today? I will explain to you the relevant knowledge about car air-conditioning maintenance and the air-conditioning inspection procedures of regular repair shops.

1. Reasons why the car air conditioner is not cool:

If the air conditioner is not cool, it is completely uncooled, and the cooling effect is poor, etc. , And this phenomenon is caused by many reasons. Don't judge blindly, make a judgment according to the regular air conditioning inspection process before proceeding with maintenance.

1. The quality and purity of fluorine (refrigerant).

The quality and purity of fluorine (refrigerant) play a vital role in car air conditioners. Inferior fluorine (refrigerant) will cause the air conditioner to operate inefficiently, and long-term use will cause damage to the compressor, so Be sure to use genuine R134a.

2, condenser and water tank.

The heat dissipation of the condenser and the water tank will also affect the use of the air conditioner. If it is not cleaned for a long time, the condenser and the water tank will be covered by foreign matter and dust.

3. The use of fluorine (refrigerant).

Many car owners believe that the more fluorine (refrigerant) in the air conditioner, the better, but this is not the case. If it is less, the pressure in the air conditioning pipe will be insufficient, and if it is more, the pressure will be too high. In the above two cases, the air conditioner cannot operate normally for cooling. Normally fill 3-4 cans of genuine R134a refrigerant.

4. The quality of the expansion valve.

The expansion valve is an important part of the refrigeration system, which is generally installed between the liquid storage cylinder and the evaporator. Inferior expansion valve will make the refrigerant not play its due role.

Second, automobile air conditioner inspection process

(1) Air conditioner integrity inspection:

1. Condenser radiator appearance inspection:

Inspection purpose: check whether it is blocked or damaged; whether the surface of the condenser is oily or leaking; whether the radiator is leaking.

2. Coolant detection:

Check purpose: check whether the coolant level is normal and turbid; if the antifreeze PH value is less than 7.5, the acidity is too strong and it is easy to damage the water tank The metal; PH value is greater than 9, too strong alkalinity, it is easy to cause corrosion inhibitor to produce precipitation and lose its anti-corrosion effect.

3. Inspection of the belt of the air-conditioning compressor:

The purpose of the inspection: check whether it is cracked and whether the tightness is normal.

4. Abnormal sound inspection:

Check purpose: Whether the belt tensioner has abnormal sound, whether the compressor has abnormal sound.

5. Working performance of air-conditioning refrigeration system components (the humidity analysis method of air-conditioning system can be used):

Check purpose: check the temperature difference between the two sides of the compressor, the temperature difference between the two sides of the condenser, etc. .

6. Refrigerant purity:

Inspection purpose: To check the purity of R134A, R12, R22, and AIR with the help of an instrument.

7. Air conditioning system pressure:

Check purpose: check the ambient temperature, high-pressure side pressure, and low-pressure side pressure.

8. Air-conditioning system wiring:

Check purpose: check whether the aging and cracking, whether the connector connection is firmly fixed

9, the air-conditioning refrigeration system:< /p>

Inspection purpose: to check whether the air-conditioning pipeline interface leaks and whether the compressor body assembly interface is damaged.

10. Insulation device inspection:

Inspection purpose: check whether the engine room insulation board is damaged, whether the exhaust duct and the muffler insulation board are damaged; the insulation board is damaged and missing Will cause the temperature inside the car to rise.

(2) Check the air supply part of the air conditioner in the car:

11. Check the air conditioner control function:

Check purpose: check whether the function switches of each panel of the air conditioner are normal.

12. Blower:

Inspection purpose: Check whether the blower is working normally and whether there is abnormal noise.

13. Check the air supply mode:

Check purpose: check the middle air outlet mode, windshield defrosting and defogging mode, direct exhaust lower ventilation mode, rear air conditioning air outlet mode , Whether the air outlet is damaged, etc.

14. Air volume detection:

Check purpose: check the air volume when the air volume switch is in the second gear and the air volume is turned on to the maximum, mainly to check the air-conditioning filter element and the evaporator blockage.

15. Air outlet temperature detection:

Inspection purpose: check several temperature values u200bu200bsuch as the maximum wind speed, the second block of the air volume, and the ventilation mode to the internal circulation.

16. Peculiar smell detection:

Inspection purpose: check whether there is a peculiar smell and the location of the peculiar smell.

17. Air conditioner filter detection:

Check purpose: check whether the filter is dirty or blocked

18. Diagnostic instrument detection fault query:< /p>

Inspection purpose: To check whether the air conditioning system is normal, and whether the engine system is normal, an instrument is required.

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