What Causes Loud Noise When the Car Air Conditioner is On?
4 Answers
Here are the specific reasons for noise when the car air conditioner is on: 1. Faulty compressor electromagnetic clutch. Since the compressor often operates under high load and varies speed from low to high, it places high demands on the electromagnetic clutch. The clutch is usually installed close to the ground and frequently exposed to rain and mud. When the bearing inside the electromagnetic clutch is damaged, it can cause noise. 2. Improper tension of the compressor drive belt. If the compressor drive belt is too tight or too loose, it can affect the lifespan of the electromagnetic clutch. A loose belt can cause the electromagnetic clutch to slip, while an overly tight belt increases the load on the clutch. 3. Lack of lubrication oil in the compressor. Improper use of lubrication oil may lead to compressor wear and failure.
I found that loud air conditioning noise is commonly caused by several reasons. The most common issue is a faulty fan motor, where prolonged use or dust accumulation prevents the motor from turning smoothly, resulting in a whooshing sound. Another possibility is a compressor malfunction, which can produce a buzzing noise under high pressure, especially in older vehicles. A dirty or clogged air filter can obstruct the airflow, making the fan work harder and louder. Loose or worn-out belts may also cause squeaking noises, most noticeable when the AC is turned on. It's recommended to first check if the filter is clean and remove any dust. If the noise persists, inspect the fan unit for looseness and replace parts if necessary. For severe cases, such as a broken compressor, professional repair is required. Don't ignore the noise—small issues can turn into major problems if left unaddressed.
The air conditioning noise is too loud when turned on. I've encountered similar situations before. Once, there were some debris stuck in the fan blades, causing a buzzing sound every time it started. Other times, when the filter hadn't been replaced for months, the accumulated dust restricted airflow, making the noise as loud as a broken blower. A loose belt can also cause noise, especially when stepping on the accelerator. Try lowering the fan speed to observe any changes, or step out of the car to listen whether the noise comes from the fan area or near the engine. Timely cleaning or replacing simple components can solve the problem. Avoid always using the maximum setting when operating the air conditioner to reduce component stress, which can lower noise and extend lifespan. Excessive noise affects mood and makes driving annoying.
Excessive air conditioning noise is primarily caused by inadequate maintenance. Accumulated dust in the fan unit or worn bearings over time can lead to loud noises; a clogged air filter increases air resistance, making the fan work harder and noisier; insufficient refrigerant or aging compressor operation abnormalities are also contributing factors. Regular inspection and maintenance are crucial, such as replacing the filter element quarterly to ensure unobstructed airflow, and cleaning and lubricating the fan system; timely replenishment of refrigerant when low. These small preventive measures can avoid major noise issues, enhance comfort, and also save fuel and money.
