What are the reasons for no cooling after adding Freon to the car?

[Lilian]

There are several reasons why a car does not cool after adding Freon: 1. Damage to the air conditioning compressor, throttle valve, or expansion valve: There is a saying in the air conditioning compressor circle, 'Low pressure high, high pressure low, replace the compressor.' The probability of air conditioning compressor damage is not high, but faults in the expansion valve and throttle valve directly lead to poor air conditioning cooling. 2. Lack of refrigerant: Since the sealing device of the air conditioner is not absolutely airtight, the refrigerant of general air conditioners tends to dissipate. Therefore, ordinary vehicles need to add refrigerant every 2-3 years. Some cars even require it once a year. If the car's air conditioning and cooling are poor, it will start to cool poorly after adding refrigerant for a period of time. When this happens, the condenser may be leaking. The method to check for leaks is quite laborious. Generally, fluorescent agent is added to the Freon oil, and a special glass is used to inspect, which can then help locate the leakage point.