What Causes Abnormal Noise in the Car Air Conditioner Blower?
3 Answers
Abnormal noise in the blower is caused by insufficient lubrication or rusting of the bearings. If the blower exhibits abnormal noise, it is recommended to apply some grease to the blower bearings. Continuing to use the blower when it is making abnormal noise may likely damage the blower bearings. Below is some relevant information about the blower: 1. The blower is an important component of the car air conditioning system. Without the blower, no air would be blown out from the air conditioning vents. The blower is located inside the glove compartment on the passenger side of the car. 2. The car air conditioner is a very important comfort feature in a car, capable of both cooling and heating. The working principle of the car air conditioner is quite simple.
Once when I started the car's air conditioning, the blower suddenly made a squeaking noise, which was particularly annoying. It turned out that a lot of dust and small leaves were stuck on the fan blades, causing friction and noise when rotating. This situation is quite common, especially when the car is parked under trees where debris can easily enter. Another possible reason is that the blades are deformed or rusted, leading to unbalanced rotation and producing a rattling sound. If the bearings of the fan motor are worn out, it can also cause a humming noise, and prolonged neglect may even lead to motor burnout. During the rainy season, increased humidity can exacerbate dust friction, making the noise more likely to occur. I usually clean the air conditioning filter regularly to prevent the accumulation of foreign objects. If using a vacuum cleaner to clean the inlet doesn’t help, it’s best to quickly visit a repair shop to disassemble and inspect the blades and motor. Don’t wait until the noise becomes louder to address the issue, as it could affect the efficiency of the air conditioning system.
Experience shows that blower noises are mostly caused by minor issues, such as debris like insects or twigs stuck in the fan blades, creating a clicking sound when rotating. Deformed or loose blades rubbing against the housing can also cause noise, often more noticeable at high speeds. Aging fan motors, especially with damaged bearings, may produce continuous humming or screeching sounds. Another angle is an unstable blower housing installation causing resonance noises on bumpy roads, while unstable circuit voltage can amplify the noise. I've encountered increased noise during rainy days due to heavier wet dust. It's recommended to first check if the filter is dirty and replace it promptly to prevent dust buildup. Sometimes, simply cleaning the blade area with compressed air to remove debris can solve the problem. Persistent noises require professional inspection to determine if the motor needs replacement.
