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Why is the air conditioning noise in a small car very loud?

2 Answers

DiRobert

07/29/25 6:17am

The loud noise from the air conditioning in a small car may be due to a damaged compressor bearing. When the air conditioning is off, the noise from the bearing's independent operation might not be noticeable. However, when the air conditioning is turned on, the magnetic head and the bearing engage together to operate, driving the internal workings of the compressor, which can amplify the noise under load. The reasons for unpleasant odors in car air conditioning are as follows: 1. Accumulation of dust inside the indoor filter and copper coils: After years of use, dust can accumulate inside the indoor filter and copper coils of the air conditioning system. Once this dust reaches a certain level, it can produce odors. When the air conditioning is turned on, these odors are dispersed into the air. 2. Moisture inside the indoor unit: After the air conditioning operates in cooling or heating mode, moisture can often remain inside the indoor unit. If the air conditioning is turned off immediately without a drying or anti-mold function, this moisture persists, leading to the growth of mold over time, which naturally produces a musty smell.

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DiIsabela

08/12/25 9:44am

A noisy car air conditioner can be really annoying. I think there are several common issues to watch out for. Dust buildup on the fan blades can cause loud noises, especially when the fan spins at high speeds upon startup. An aging compressor may also lead to increased noise, particularly after several years of use. Check the belt tension—if it's too loose, it can slip and produce a flapping sound. If the refrigerant is leaking or the pressure is uneven, the system may emit a hissing noise. Additionally, a loosely installed fan can vibrate the entire AC housing. I've encountered this issue several times and learned to open the AC compartment cover myself to clean the fan and filter, which worked well. However, if the noise continues to worsen, I recommend visiting a repair shop for a thorough inspection to avoid further damage. Regularly cleaning the AC vents while driving can prevent such noises and save you a lot of headaches.

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