What Causes the Abnormal Noise When Accelerating with Air Conditioning On in a Car?

2 Answers
DanielaDella
07/28/25 9:58pm
When there is an abnormal noise while accelerating with the air conditioning on in a car, the first step is to determine whether the noise is coming from inside the pump or from the belt. If the noise is from the belt, it can usually be resolved by adjusting the belt tension or replacing the belt. If the noise is from inside the pump, check the air conditioning pressure first. If the pressure is too high, it can cause abnormal noise, which can be resolved by releasing some refrigerant. If this does not solve the problem, the air conditioning pump may need to be replaced. Below is more information about car air conditioning: 1. Function of Car Air Conditioning: The car air conditioning system, commonly referred to as car AC, is used to regulate and control the temperature, humidity, air cleanliness, and airflow inside the vehicle to create a comfortable environment for passengers, reducing travel fatigue. It also provides a better working condition for the driver, playing a crucial role in ensuring safe driving. 2. Air Conditioning Layout: Different types of air conditioning systems have different layouts. Currently, most cars use an integrated heating and cooling air conditioning system. This setup combines the evaporator, heater core, centrifugal blower, and control mechanism into a single unit, known as the air conditioning assembly. 3. Components of Air Conditioning: A car air conditioning system generally consists of components such as the compressor, electronically controlled clutch, condenser, evaporator, expansion valve, receiver-drier, piping, condenser fan, vacuum solenoid valve, idle speed controller, and control system.
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VonEvangeline
08/12/25 2:32am
I noticed that every time I start the air conditioning and step on the gas pedal, the engine makes a creaking or whistling sound, which is really unsettling. Having driven for several years, I initially thought it was normal noise until a conversation with a friend revealed it was a serious issue. The main reason is that the air conditioning compressor starting up increases the engine load, causing old belts to slip. Especially in summer when the AC is on, if the belt has cracks or severe wear, it can produce abnormal noises under high load. Another possibility is an issue with the compressor clutch, which can squeak when not engaging properly. I also heard that loose engine mounts can amplify the noise. Worried that long-term neglect could lead to belt breakage or overheating, I promptly checked the belt condition: after turning off the engine, visible cracks on the belt surface confirmed the fault. I immediately took the car to a repair shop to replace the belt, and now it’s much quieter. The maintenance cost wasn’t high, but safety comes first, especially when traveling with family—it’s not worth the risk.
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