What is the reason why the car air conditioner cannot switch the air direction?
2 Answers
Car air conditioner air direction adjustment failure may be due to the infrequent use of the air direction switch, causing it to become stuck. Reasons for car air conditioner fan speed malfunction: The speed control resistor regulates the fan voltage to adjust the wind speed. It is prone to damage, usually due to a blown resistor fuse, which needs to be replaced. Types of air conditioners: Independent type (dedicated to driving the compressor with a separate engine, with large cooling capacity and stable operation, but high cost, large size and weight, mostly used in large and medium-sized buses) and non-independent type (the air conditioner compressor is driven by the car engine, and the cooling performance is greatly affected by the engine operation, with poor stability, mostly used in small buses and cars).
I found that the car's air conditioning can't switch the airflow direction, and the most common reason is a faulty small air vent motor. That motor is responsible for adjusting the vent direction and can easily get stuck or burn out after prolonged use. Issues like poor contact in the control knob or aging wiring causing a short circuit are also common. Last time, my car couldn't blow hot air to the footwell in summer, and in winter, cold air blew straight into my face, making driving extremely uncomfortable. Check if any fuses have blown. If you're handy, you can disassemble the center console to clean dust from the vents—just avoid using excessive force to twist them. Regular maintenance while driving, such as cleaning the filter to reduce dust buildup, can help prevent the vents from getting completely stuck, which may degrade the overall performance of the air conditioning. It's best to consult a professional mechanic promptly to avoid worsening the issue and affecting your driving experience.
