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What is the reason for abnormal noise in the engine when the car's air conditioning is turned on?

2 Answers

DominicFitz

07/25/25 4:20pm

The reason for abnormal noise in the engine when the car's air conditioning is turned on is: Air conditioning pump head failure: This type of failure mainly involves the engagement surface of the air conditioning electromagnetic clutch. If the electromagnetic clutch is worn, it will cause the aforementioned noise phenomenon. If the fault source is confirmed, it is recommended to replace it. Bearing performance failure: The bearing performance here mainly refers to the compressor clutch bearing. This type of fault source usually occurs when the air conditioning is working, is directly related to acceleration, and the noise characteristic is a "buzzing" sound. Therefore, based on the fault phenomenon, it is recommended to go to a repair shop to check the above-mentioned maintenance suggestions.

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MacHannah

08/11/25 9:46pm

When the car's air conditioning starts, there is a noise from the engine, and the main possible reasons are as follows. The most common is the buzzing or hissing sound from the air conditioning compressor, especially when the compressor is under load. Aging bearings or internal component wear can cause such abnormal noises. Secondly, the belt is also prone to issues, such as the compressor belt slipping or being loose, which can produce a squeaky friction sound during startup. Additionally, the pulley, especially the idler or tensioner pulley bearing wear, can create a clunking metal sound. A less likely possibility is blocked air conditioning pipes, where sudden pressure changes can also cause abnormal noises. Identifying the location of the sound is crucial. If the noise comes from the right side of the engine compartment, it's usually a compressor issue. If the noise becomes significantly worse, it's recommended to have a mechanic check the belt tension or inspect the compressor and pulley system bearings with a stethoscope.

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