What are the reasons for the sudden failure of the blower?
2 Answers
The reasons for the sudden failure of the blower: 1. Fuse failure; 2. Blower relay failure; 3. Internal failure of the blower motor; 4. Failure of the power transistor or blower switch; 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 is carried out by 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 shape of the casing to the blower outlet. The high-speed airflow has a certain wind pressure, and new air enters from the center of the casing to replenish.
Oh no, the blower suddenly stopped working—I've encountered this issue before. When driving my old car, the AC system went haywire and the blower wouldn't budge, with multiple possible causes. The most common is a blown fuse, located in the fuse box under the dashboard—a tiny plastic piece breaks and the blower stops. There's also relay failure; that little gadget controls current flow, and if it's broken, there won't even be a sound. The blower motor itself might be faulty, especially in older cars, where carbon brushes wear out or bearings seize up. Wiring-wise, if connections are loose or corroded, instability can cause malfunction. Additionally, if the control switch on the dashboard has poor contact, pressing it won't do anything. Be careful—when the blower fails, the AC system stops working, making summers unbearably hot and winters foggy, compromising driving visibility and safety. Check it yourself or see a mechanic ASAP—don't delay. For maintenance, regularly clean the air intake to prevent dirt buildup.
