How Often Should Car Air Conditioning Be Recharged with Freon?

[VanWalter]

It depends on usage; you can add more when it's low or the cooling effect is poor. Signs of low Freon in air conditioning: 1. Low-pressure pipe (thick pipe) becomes dry: Due to insufficient Freon, the boiling point of the refrigerant in the evaporator decreases, raising the temperature of the refrigerant in the low-pressure pipe valve. 2. High-pressure pipe frost: Caused by a drop in liquid pipe pressure and boiling point, making the high-pressure pipe temperature below freezing, causing moisture in the air to freeze. 3. Frost on the evaporator: If the frost is minimal and covers a small area, it indicates insufficient refrigerant leading to reduced cooling capacity. 4. No heat from the outdoor unit exhaust: Due to insufficient refrigerant, causing lower condensation pressure and temperature. 5. No water discharge from the indoor unit drain pipe: Because low Freon reduces cooling capacity, preventing the condenser from condensing water. 6. Pressure measured at the outdoor unit's Freon charging port is below 0.45MPa: Due to insufficient refrigerant, leading to reduced evaporation pressure.