What are the reasons for the weak airflow from the air vents in a BMW 3 Series?

[VanBethany]

The reasons for the weak airflow from the air vents in a BMW 3 Series are as follows: Incorrect air direction selection: If the air direction is set to blow towards the front windshield, it will significantly reduce the airflow. Blower motor malfunction: Common issues with the blower motor include failure to operate, abnormal noise, short circuit, or insufficient power. When the blower motor malfunctions, the cold air from the vehicle's evaporator cannot be distributed, leading to evaporator icing and ultimately affecting the normal operation of the car's air conditioning. Condenser or evaporator blockage: If the condenser's exterior or evaporator is clogged with debris such as catkins or dust, it will impair the condenser's efficiency, ultimately affecting the car's cooling performance. Additionally, excessive dirt on the evaporator's surface can easily degrade the air conditioning's cooling effect. Dirty air filter: If the car's air filter is excessively dirty, it can obstruct the airflow, allowing only a portion of the air to enter the cabin, which naturally results in a noticeable reduction in airflow.