Which component is often responsible for limiting air flow from the A/C system?

The cabin air filter plays a crucial role in maintaining the efficiency of the air conditioning (A/C) system by filtering out contaminants such as dust, pollen, and other particles from the air entering the vehicle's interior. Over time, this filter can become clogged with debris, which restricts airflow through the ventilation system. When airflow is limited, the A/C may not perform effectively, leading to reduced cooling performance and a less comfortable driving experience.

Proper maintenance of the cabin air filter is essential for ensuring that the A/C system operates efficiently. Regularly replacing or cleaning the cabin air filter can help maintain optimal airflow and enhance the overall performance of the A/C system. In contrast, the other components listed—refrigerant lines, expansion valve, and compressor—are more involved in the system's refrigeration cycle and do not directly limit airflow into the cabin.