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What are the reasons for one side of the car air conditioner not cooling?

2 Answers

DiKeira

07/29/25 8:10am

Common reasons for uneven cooling in car air conditioners include: air vent issues, where one of the air vent servo motors is faulty, causing one side to not cool; the air valve plate being stuck, obstructing its rotation and affecting airflow on one side; blockage in one side of the air duct; or, if it's an automatic air conditioner, the dual-zone control function might be activated. Types of car air conditioners: 1. Independent type: Uses a dedicated engine to drive the compressor, offering high cooling capacity and stable operation, but with higher costs, larger size, and weight, commonly used in large and medium-sized buses. 2. Non-independent type: The compressor is driven by the car engine, with cooling performance significantly affected by engine operation, resulting in less stability, mostly used in small buses and sedans.

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AlinaFitz

08/13/25 4:10am

I've found that when a car's air conditioning blows warm air on one side, it's usually caused by several common issues. The most frequent culprit is insufficient refrigerant or a leak, where one side's piping leaks Freon while the other side still barely functions. It could also be due to a blocked expansion valve, preventing the refrigerant from being evenly distributed. A faulty blend door actuator can also cause hot and cold air to mix incorrectly, resulting in warm air on one side. During my last car repair, the technician mentioned that a malfunctioning automatic AC control module is another common cause, as it may regulate airflow incorrectly. If the AC ducts aren't cleaned regularly, dust buildup can also lead to uneven airflow. I recommend checking the refrigerant pressure before hot weather arrives and addressing any issues promptly at a professional repair shop to avoid sudden failures during high-temperature driving, which can ruin travel comfort. Regular maintenance of the AC system can prevent such problems and extend its lifespan.

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