What Causes Weak Airflow from Car Air Conditioning Vents?
2 Answers
The reasons for weak airflow from car air conditioning vents are as follows: 1. Incorrect air direction selection: If the air direction is set to blow towards the front windshield or side windows, the airflow into the cabin will feel weak. 2. Blower motor malfunction: If the blower motor experiences a short circuit or power reduction, the airflow from the car air conditioning will decrease. In this case, it is recommended to visit a 4S shop or professional repair shop for inspection. 3. Dirty air filter: A clogged air filter can obstruct airflow. The air filter is designed to filter impurities from the air entering the cabin. If too many impurities accumulate, it will affect the airflow from the vents.
Last time my AC airflow was extremely weak, and it took me a while to figure out why. The most common issue is when the cabin air filter gets clogged with dust after prolonged use, blocking the airflow. You can replace the filter yourself—it's usually located behind the glove box on the passenger side. Additionally, if the blower motor slows down or makes strange noises, it's likely due to a faulty motor or speed control resistor, which requires a repair shop inspection. Also, check the air ducts for any obstructions like leaves. I once had a case where the evaporator was so dirty that it frosted up, affecting airflow. I recommend checking these areas first to avoid being tricked into replacing the entire system.
