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What Causes the Squeaking Noise When the Car Air Conditioner is Turned On?

2 Answers

DiIsaac

07/29/25 5:24am

When the car air conditioner is turned on and a squeaking noise occurs, the reasons may include a loose or slipping air conditioner belt, a faulty compressor, or foreign objects in the blower and air ducts. Solutions for the squeaking noise when the air conditioner is on: 1. Clean the air conditioner belt: If the air conditioner pulley and belt slip, a sharp friction noise will be produced during the slipping process. Check if there is oil or dirt on the belt. If the belt is slipping due to oil or dirt, clean it thoroughly. If not, adjust the compressor's position bolts to tighten the belt, which can increase friction. 2. Tighten the belt: If the noise is caused by a loose belt, you can press the belt to check its tension. If it is too loose, tighten it. If the belt has been used for too long, it needs to be replaced. 3. Replace the tensioner pulley: If the belt tensioner pulley is damaged, it can also cause noise and needs to be replaced with a new one. 5. Clean the blower: Foreign objects in the blower and air ducts can also cause noise, so the blower and air ducts need to be cleaned.

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StNova

08/12/25 8:59am

I've noticed a squeaking noise when the car's air conditioning is on, and I've encountered this issue several times. From my experience, the most common cause is a problem with the belt. Over time, the belt can age and loosen, causing it to squeak when the compressor starts up, with the sound coming from the front part of the engine compartment. Secondly, a faulty compressor bearing or insufficient lubrication can also produce similar noises, especially when the air conditioning is first turned on, making the noise more pronounced. Additionally, dust buildup in the blower or deformed fan blades can cause a buzzing or squeaking sound when the air flows, but this noise is usually near the air vents inside the car. My advice is not to panic—try turning on the cold air to locate the source of the noise, check the belt for wear, or use some lubricant as a temporary fix. Addressing the issue promptly is crucial, as a broken belt or a failed compressor can lead to more expensive repairs. Regular maintenance, such as replacing the belt and cleaning the air filter, can help prevent these annoying problems.

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