What are the reasons and solutions for the Passat's air conditioning not cooling?

[DeMadison]

Passat's air conditioning not cooling reasons include dust on the condenser coil and long-term closure of the internal circulation switch. Below are detailed explanations regarding the Passat's air conditioning not cooling: Dust on the condenser coil: The condenser coil behind the front grille is covered with dust, leading to poor cooling performance. In this case, the owner can resolve the issue by rinsing the dust off the condenser coil with a water hose during car washing. Long-term closure of the internal circulation switch: The internal circulation switch is closed, resulting in reduced cooling efficiency. There is a button on the dashboard with a car icon and a U-shaped arrow next to it, which is the internal circulation switch. If the owner accidentally turns off the internal circulation switch, it means the air conditioning enters external circulation mode, allowing outside air to enter.