What Causes Loud Noise When the Car Air Conditioner is On?
4 Answers
Reasons for loud noise when the car air conditioner is on: 1. The fan blades inside the air conditioner are deformed and need to be replaced; 2. The motor of the fan inside the air conditioner is faulty, it is recommended to repair or replace the fan; 3. There is excessive dirt inside the air conditioner, it is recommended to clean the air conditioner. The car air conditioning refrigeration system consists of a compressor, condenser, liquid storage dryer, expansion valve, evaporator, and blower, all connected by copper pipes and high-pressure rubber hoses to form a sealed system. When the refrigeration system is operating, the refrigerant circulates in different states within the sealed system. The car air conditioner is used to adjust and control the temperature, humidity, air cleanliness, and air flow inside the car cabin to a better state, providing a comfortable riding environment for passengers, reducing travel fatigue, creating good working conditions for the driver, and ensuring safe driving.
I've only had my car for six months, and the AC makes a loud buzzing noise as soon as I turn it on, which is quite annoying. After doing some research, I found there could be many reasons: the most common is the loud noise when the compressor starts up, which is normal. However, if the noise is persistently unbearable, it might be due to a clogged or dirty fan filter, obstructing airflow. An aging or poorly lubricated blower motor can also cause squeaky noises. A loose or nearly broken compressor belt might produce a screeching sound. I suggest starting by cleaning the AC filter—there are online tutorials for DIY cleaning. Don’t delay too long to avoid damaging other components. Since driving in summer heavily relies on the AC, regular maintenance can prevent noise from worsening and ensure a comfortable ride.
Having driven for over a decade, I've encountered air conditioning noise issues several times. It's normal for the compressor in the engine bay to make sounds during operation, but excessive noise requires attention: a loose belt may produce high-pitched sounds, worn compressor bearings can cause roaring; a clogged cabin air filter increases fan load, resulting in loud whirring noises; insufficient refrigerant makes the compressor work overtime. My routine includes replacing the filter annually, checking belt tension, and if the fan sounds abnormal, inspecting the motor or lubricating bearings. Excessive noise compromises driving safety - have it professionally inspected and repaired at a reputable shop, don't cut corners on maintenance.
My car's air conditioner has been making a loud rumbling noise whenever I turn it on recently, which is really annoying. Common causes include dust accumulation or deformation of the fan blades causing unstable rotation; loose compressor connections causing vibration noises; or a dirty filter restricting airflow and forcing the fan to work harder. Try replacing the filter yourself first—buying parts online is cheap and easy. Pay attention to where the noise is coming from—whether it's under the dashboard or near the engine can help identify the problem. Address it promptly to prevent small issues from becoming bigger, making maintenance simpler and saving time and effort.
