What are the reasons for the blower not working?
3 Answers
Reasons for the blower not working: 1. Fuse failure; 2. Blower relay failure; 3. Internal failure of the blower motor; 4. Power transistor or blower switch failure; 5. Circuit failure; 6. Air conditioning control unit failure. The working principle of the blower is similar to that of a centrifugal fan, except that the air compression process usually occurs through several working impellers under the action of centrifugal force. The blower has a high-speed rotating rotor, and the blades on the rotor drive the air to move at high speed. The centrifugal force causes the air to flow along the involute-shaped casing toward the blower outlet. The high-speed airflow has a certain wind pressure, and new air enters from the center of the casing to replenish it.
Last time my car's AC fan stopped working, the first thing to check was whether the fuse had blown—these are prone to burning out. Just locate the corresponding position in the fuse box and inspect the fuse's condition. Another common issue is the fan motor; over time, the bearings can seize or the coils can short-circuit, causing it to fail. If you hear the motor humming but the fan isn't spinning, it's likely a problem here. Additionally, a faulty control switch or aged, damaged wiring can interrupt the electrical signal. I've fixed it a few times myself—for example, loose or poorly connected plugs can cause issues, and sometimes just unplugging and re-plugging a few times solves it. Relay failures are also worth noting, as they control the current switch, and if they malfunction, the power supply stops. Voltage instability or power supply problems shouldn't be overlooked either—check whether the battery and alternator output are normal. In short, start with the fuse and simple wiring checks, and if that doesn’t work, take it to a professional shop to avoid unnecessary hassle.
The AC blower stopped working, and my first thought was to check if the fuse has blown—these things are prone to overloading and burning out. Fan motor failures are also common, such as excessive carbon brush wear or internal coil damage. A stuck or malfunctioning switch button on the control panel can prevent signals from being sent. Wiring issues, like loose connectors or corroded/broken harnesses, can interrupt power delivery. Problems with the relay assembly are troublesome too, as it manages current flow but may fail. External factors, such as low battery voltage or a faulty alternator not charging, can also trigger a chain reaction. I recommend troubleshooting step by step: test the switch to hear if the motor makes a faint sound—if it does, the motor is fine but there's a disconnection elsewhere; if silent, prioritize replacing the fuse. During maintenance, cleaning the AC filter can prevent issues by ensuring smooth airflow. Address it promptly to avoid driving in stifling heat and frustration.
