Here are the reasons why the air conditioning doesn't work after replacing the car battery: 1. Damaged air conditioning compressor: There is a saying in the industry about air conditioning compressors: 'Low pressure high, high pressure low, replace the compressor.' The probability of air conditioning compressor damage is not high, but if the expansion valve or throttle valve malfunctions, it can directly lead to poor air conditioning cooling. 2. Lack of refrigerant: Because the sealing device of the air conditioning system is not absolutely sealed, the refrigerant in the air conditioning system will generally escape over time. Therefore, vehicles usually need to add refrigerant every 2 to 3 years. Some cars may even require it once a year. If the car's air conditioning cooling is poor and the problem recurs shortly after adding refrigerant, this usually indicates a condenser leak. The method to check for leaks is relatively cumbersome. Generally, fluorescent agent is added to the refrigerant oil and viewed with special glasses to locate the leak. There is also a simpler method suitable for more severe leaks, where obvious oil stains can be seen on the surface of the condenser through the grille. In such cases, there is usually a condenser leak. 3. Dirty condenser: In summer, it is often found that the air conditioning cooling is poor, but testing shows no problems with the air conditioning system, and the high and low pressures are basically normal. In this case, it is usually necessary to clean the radiator.
