How often should car air conditioning be recharged with Freon?

[OJeffrey]

Car air conditioning generally needs to be recharged with Freon every 5 years. The detailed reasons for air conditioning not cooling are as follows: 1. Lack of Freon. This issue manifests as insufficient cooling compared to normal operation, rather than a complete lack of cooling. 2. Low power supply voltage. This problem shows that the air conditioning cools normally when the voltage is stable, but unstable voltage affects the cooling performance. 3. Low air conditioning power. This situation is often overlooked in daily use. Solutions generally include increasing the number of air conditioning units; improving the usage environment conditions; enhancing the airtightness of the environment; and reducing heat sources in the air conditioning environment. 4. High external ambient temperature. This lack of cooling is common when the outdoor unit is installed in a confined space or the surrounding temperature is too high. The simplest and most direct solution is to change the operating environment of the outdoor unit. 5. Long-term lack of cleaning and maintenance for the air conditioning. This situation is most easily overlooked, as air conditioning requires regular cleaning and maintenance.