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

[MarcusLee]

The reasons for the Volkswagen Sagitar's air conditioning not cooling can be summarized into the following 6 points: 1. Lack of refrigerant. Car air conditioning systems typically require refrigerant replenishment every 2-3 years, with most refrigerant loss occurring due to leaks. 2. Damaged air conditioning flap. 3. Dirty condenser requiring radiator cleaning. The condenser's purpose is heat dissipation. When cleaning, first use an air gun to blow away debris, then rinse with a water gun. 4. Faulty air conditioning compressor, throttle valve, or expansion valve. Malfunctions in the expansion or throttle valves directly lead to insufficient cooling. 5. Aged or loose belt. During regular maintenance, 4S shops usually recommend belt replacement. If not replaced, slippage may occur during operation, potentially causing belt breakage, abnormal noise, loss of power assistance, or inadequate cooling. 6. Moisture in the system. The car's air conditioning refrigeration system contains a dryer that absorbs moisture from the refrigerant and prevents excessive moisture from reducing cooling capacity. When the desiccant in the dryer becomes saturated, it can no longer filter out moisture.