What Causes the Low-Pressure Pipe of a Car Air Conditioner to Freeze and Stop Cooling?

[LeAyla]

Car air conditioner low-pressure pipe freezing and not cooling is caused by insufficient refrigerant, a dirty condenser, or moisture in the refrigerant. Insufficient refrigerant: Minor leaks lead to a lack of refrigerant. The refrigerant circulates continuously in the cooling system and achieves cooling through its own state changes, primarily lowering the temperature of the air inside the car. Adding refrigerant can solve the issue, but note that if adding from the low-pressure side, the refrigerant bottle must not be inverted; if adding from the high-pressure side, the engine must not be started. Dirty condenser: The car air conditioner condenser dissipates heat from the high-temperature, high-pressure refrigerant vapor discharged by the compressor, cooling it into a high-pressure liquid refrigerant. The working condition of the condenser and evaporator directly affects the cooling system's efficiency, compressor power consumption, and the overall economy of the air conditioning unit. A dirty condenser reduces cooling performance, so impurities and scale should be cleaned promptly, and replacement may be necessary. Moisture in the refrigerant: The presence of water in the refrigerant degrades the air conditioning system's performance. Replace the desiccant or dryer in the car air conditioner, and at the same time, evacuate the system and refill it with the appropriate amount of new refrigerant.