What Causes Uneven Airflow from Car Air Conditioning Vents?

1 Answers
VanElliot
07/30/25 3:53am
If the airflow is weaker when using the external circulation mode but normal with internal circulation, it is likely due to a clogged cabin air filter. In this case, replacing the cabin air filter should resolve the issue. Internal Air Duct Flap Issue: If the airflow remains weak regardless of the circulation mode, it may indicate problems with the internal air duct flap or similar components. This situation is less common than the previous one. It is recommended to first inspect the cabin air filter. Replacing a dirty air filter that is obstructing airflow into the vehicle may solve the problem. How Car Air Conditioning Works: The car air conditioning refrigeration system consists of a compressor, condenser, receiver-drier, expansion valve, evaporator, and blower motor. These components are connected through copper (or aluminum) pipes and high-pressure rubber hoses to form a sealed system. When the refrigeration system operates, the refrigerant circulates through this closed system in different states.
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