What Causes the Car AC to Only Blow Air at the 4th Speed?

1 Answers
DeJuliet
07/30/25 2:21am
The reason why the car AC only blows air at the 4th speed is due to a damaged blower motor resistor. The car AC may also experience the following issues: 1. Reduced airflow: A dirty cabin air filter can cause the blower motor to make noise, but the airflow remains weak. 2. Inability to adjust airflow direction: Damaged air deflectors or airflow direction control switches can prevent airflow direction adjustment. 3. Abnormal airflow: A frozen evaporator can cause sudden loss of airflow at high speeds, though the blower motor can still be heard running. Restarting the AC may restore airflow. 4. Uneven airflow between left and right vents: It is normal for the right vent to have stronger airflow than the left vent.
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