What Causes the Loud Noise from the Car Air Conditioning?

[GenevieveMarie]

Car air conditioning noise can be caused by the following reasons: 1. Abnormal wear of the air conditioning pump leading to noise. 2. Loose or excessively long air conditioning belt, insufficient tension from the tensioner. 3. Leaves entering the interior of the air conditioning blower. 4. Malfunction of the blower. Below is an introduction to air conditioning maintenance: 1. Comprehensive inspection of the air conditioning system: When using the air conditioning for the first time in summer, inspect the air conditioning system, such as checking the refrigerant and whether the air filter is too dirty through the reservoir, and whether there are foreign objects in the radiator. 2. Pay attention to air conditioning cleaning: The air filter should be replaced regularly, otherwise the air conditioning may produce a musty smell. Additionally, the condenser should be cleaned periodically, and the radiator should be removed for thorough cleaning.

[LePaislee]

I've just fixed a similar issue. Most of the time, air conditioning noise is caused by dust buildup in the fan area—when the blades can't rotate smoothly, the friction sound increases. A clogged filter is another common reason; restricted airflow forces the fan to run at high speed, creating noticeable noise. I've also encountered cases where the compressor clutch was worn out, especially in older vehicles, producing squeaking sounds upon startup. I recommend cleaning the fan and air ducts every season—it's quite simple to disassemble and do it yourself. Replacing the filter is also a cost-effective way to maintain cabin quietness. Don't underestimate it; aside from affecting driving comfort, it also increases fuel consumption. Timely maintenance saves money and hassle, reduces noise on long trips, and enhances the overall driving experience.

[SanEmilia]

Last month, my car's AC suddenly started buzzing loudly, which was incredibly annoying. After getting it checked, I found out there was mud on the fan blades and they were deformed. The mechanic said a dirty filter is also common—when air can't get through, the fan spins faster, doubling the noise. Compressor issues, like refrigerant leaks or internal wear, can cause screeching sounds. Since then, I've made it a habit to proactively clean the fan before spring and summer and replace the filter every three months to prevent debris buildup. Now, the AC runs quietly and efficiently. I recommend friends try this—small maintenance can prevent big problems, and driving feels much better now.

[NevaehAnn]

Having used cars for many years, I've encountered air conditioning noise issues multiple times. The simplest cause is setting the fan speed too high - excessive airflow naturally creates noise. When air filters age and clog, increased resistance forces the blower to work harder, amplifying the noise. If the sound resembles squeaking, it might indicate bearing or compressor problems. Regular cleaning of fan blades and checking filter replacement needs often solves these issues. Preventive measures save trouble and ensure peace of mind - don't wait until the noise worsens to address it. Driving safety comes first.