Self-use maintenance of automotive air conditioners

Car air conditioning powered by engine

The automotive air conditioning system is a device for cooling, heating, ventilating, and purifying air in the cabin. It can provide a comfortable ride environment for the occupants and reduce the fatigue of the driver. At present, most passenger car air-conditioning systems are driven by the engine, and all have cooling and heating functions.

Manual air conditioning automatic air conditioning core components are consistent

Vehicle air conditioning is divided into manual and automatic adjustments. Manual air conditioning toggles the function keys on the control panel to control temperature, wind speed, and wind direction. The automatic air conditioner uses vacuum control mechanisms and electronic actuators to control the set air volume, temperature, and wind direction. But both are basically the same for the core cooling and heating components of the air conditioner. The air conditioner is generally composed of a compressor, an electronically controlled clutch, a condenser, an evaporator, an expansion valve, a receiver dryer, a hoses, a condenser fan, and a vacuum electromagnetic system. Vacuumsolenoid, idler and control system. Automotive air-conditioning is divided into high pressure pipelines and low pressure pipelines. The high pressure side includes the compressor output side, high pressure piping, condensers, receiver drier, and liquid lines; the low pressure side includes the evaporator, accumulator, return air line, compressor input, and compressor oil sump.

Liquid storage dryer - is actually a device that stores refrigerant and absorbs moisture and impurities in the refrigerant. On the one hand, it is equivalent to the car's fuel tank, which supplements the refrigerant with extra refrigerant. On the other hand, it filters out the impurities doped in the refrigerant like an air filter. The liquid storage dryer is also equipped with a certain amount of silica gel material, which plays a role in absorbing moisture.

Condensers and Evaporators - Although they are not the same, they are similar in structure. They are all honeycomb-like aluminum tanks that resemble tanks, and are used as a means of achieving heat exchange between the outside air and the material inside the pipes. The condensation of the condenser refers to the cooling of the refrigerant in its pipeline from the gaseous state to a liquid state. The principle is similar to that of the engine's heat dissipation tank (the only difference is that the tank's water is always liquid), so it is often installed in the front of the car, together with the tank, this design is conducive to the use of the front of the airflow for heat dissipation. The opposite of the evaporator and the condenser, it is the place where the refrigerant changes from a liquid to a gas (ie evaporation) that absorbs heat.

What should I do if the air conditioning is not cool?

There are a variety of reasons that can lead to poor air-conditioning system cooling, but many reasons simply do not need to go to the 4S shop for maintenance to be eliminated, below, we will illustrate a few basic air-conditioning failures, if your air-conditioning has similar problems, Please follow our order one by one.

First, ensure that the air conditioner's compressor key (AC or ECO) is turned on.

NO1. Check the air-conditioning filter element. If the air-conditioning filter element is too dirty, it will lead to small air-conditioning volume and increase air pollution in the vehicle.

NO2. If your air conditioner suddenly becomes smaller after a certain period of time, then congratulations, your air-conditioning cooling effect is very good, this is caused by the icing of the evaporation box, just increase the temperature point.

NO3. If the air conditioner works normally, but it always feels less powerful than before, then you need to rinse the condenser board with clean water. Excessive dust will affect the heat exchange efficiency of the air conditioning system and affect the quality.

NO4. If the air-conditioning cooling system is started, the two cooling electron fans operate at the same time. However, the air-conditioning pump does not pull in. Of course, the air-conditioning is not cooling at all, and it is likely that the car has a computer failure.

NO5. If the vehicle idling is too low, it will cause the air-conditioning pump to repeatedly suck or not work, because the engine computer needs to run the air-conditioning pump under the premise of ensuring the safety of driving. This fault can be judged by gently stepping on the throttle and observing the working condition of the air-conditioning pump.

NO6. If all of the above problems are ruled out, then your air conditioner is likely to have no refrigerant (commonly known as lack of fluoride). It is basically impossible for owners of such failures to repair themselves, and they need to go to a 4S shop or a repair shop for processing.

The following operations are not recommended for owners to operate on their own:

The first is to pressurize and use an air compressor to inject compressed air into the air conditioning system.

Then observe if the system pressure continues to decrease.

If there is a reduction in system pressure, the leak point needs to be checked with foam water or a fluorescent agent. The air-conditioning compressor, condenser, air conditioning pipeline and liquid storage dryer are all parts that need to be inspected. The leakage point will be after spray foam water. Continuous bubbles appear.

If there is no leak point in the above position, the leak point is likely to be in the evaporation box inside the center console.

After the leakage point has been processed, the pressure test of the air-conditioning system must be conducted again. Vacuum is applied to the air-conditioning system while ensuring that the system pressure is constant.

The air-conditioning system in the state of vacuum negative pressure will add inhaled refrigerant to the refrigerant. After adding a certain amount of refrigerant, the vehicle will be started and the compressor of the air-conditioner will be turned on to continue to join the refrigeration. At this time, the air-conditioning system has completely worked properly. .

The special point is that the refrigerant is not as good as possible. The vehicle refrigerant must be added in accordance with the model and refill amount specified by the manufacturer. Too much or too little refill or use the wrong model to add refrigerant will cause the air-conditioning to work. Normal or faulty.

Finally, if the conditions permit, we'd better perform a simple cleaning and sterilization operation on the air conditioning system. Out of the previously mentioned flushing condenser board, we have to bring a bottle of air-conditioning cleaning agent.

First of all, in the case of turning off the air conditioner, spray cleaning agent into the air outlet of the vehicle, and then wait for 5 minutes.

Now, turn on the air conditioner and turn the wind up to the maximum, spraying the cleaner on the outside air intake.

Continue to run the air conditioner for about 10 minutes. The detergent that carries the pollutants will be gradually discharged from the air conditioning drain hole.

Finally, clean the car should pay attention to window ventilation.

Please note: It is absolutely impossible to sleep in a closed vehicle, especially when air conditioning is on, which can cause coma or death due to lack of oxygen.