What to Do When the Car Makes a Buzzing Sound with AC On?

[HarrisonDella]

Possible causes include loose screws, aging or loose rubber seals, or issues with the tailgate lock. Below is relevant information: 1. Compressor: The compressor is driven by the engine. When the linkage between the engine and the compressor is not smooth, the compressor is prone to produce abnormal noises. This is especially noticeable during idle speed, as the compressor places a load on the engine. When the engine idles and drives the compressor, instability may occur, leading to increased noise. Compressor noises can vary, such as clanking sounds: a heavy metallic impact noise, which may indicate severe wear of the engine mounting bracket over time. When the engine speed changes, this can cause clanking. 2. Cooling system failure: Liquid may be visible under the car. Additionally, severe tire leaks or vacuum chamber leaks in the engine can also produce this sound. Heavy knocking sounds: resembling dull knocking noises. This is mostly due to engine issues, likely caused by vehicle aging.