What are the reasons for the sudden failure of the blower?
4 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.
Hey, the blower stopped working? Let's troubleshoot it yourself. Start with the fuse: open the fuse box cover under the steering wheel, locate the fuse labeled for the blower, pull it out to check if it's blown, and try replacing it with a new one. Next, inspect the relay—it's a small switch box near the fuse box—swap it with a known good one to see if the blower starts. If that doesn't work, shift focus to the blower motor: it's located behind the glove compartment on the passenger side. Remove it to check if the blades are jammed or if the motor is burnt out. Then examine the wiring: look for loose connections, open circuits, or shorts between the switch and the motor. A faulty blower resistor could also be the culprit, especially if the fan only works on one speed or not at all. Testing is straightforward with a multimeter—just check if the voltage is normal. If you can't fix it, take it to a professional to avoid costly damage to the AC system. Regular cleaning helps prevent dust buildup.
The blower suddenly stops working, commonly due to a blown fuse or relay failure. When the fuse in the fuse box blows, the circuit is interrupted. If the relay is faulty, control is lost. Motor damage can occur from aging or jamming, causing the motor to stop rotating. Wiring issues such as corrosion or short circuits lead to unstable current. Control module failures are more common in modern vehicles. This affects air conditioning and defogging, significantly increasing driving safety risks, especially at night or in rainy conditions. It is recommended to inspect key components for a quick resolution.
