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

[LeoDella]

Passat air conditioning not cooling reasons are: 1. Air filter clogged; 2. Air conditioning compressor damaged; 3. Engine belt slipping; 4. Lack of refrigerant. Solutions for air conditioning not cooling: 1. Add air conditioning refrigerant; 2. Check the pipes, air conditioning pump, condenser, and evaporator in the car's air conditioning system for any damage that may cause refrigerant leakage; 3. Check the compressor; 4. Clean or replace the air filter. Functions of air conditioning: 1. Achieve cooling effect by continuously transforming and circulating refrigerant; 2. Draw in fresh external air for ventilation and air exchange to prevent window fogging; 3. Use engine coolant, waste heat, or heat generated by a burner as a heat source for heating, which is then blown into the car by a blower to raise the temperature for heating; 4. Remove dust, odors, smoke, and toxic gases from the car's air to freshen the interior air, and humidify the car's air to increase its relative humidity.