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What causes the abnormal noise when turning on the air conditioning in a Peugeot 408?

2 Answers

SanFernando

07/28/25 10:58pm

Here are the reasons for the abnormal noise when turning on the air conditioning in a Peugeot 408: 1. Cooling fan: The noise comes from the car's radiator cooling fan. When the fan receives the command to turn on the air conditioning, it operates at high speed. Normally, it only works when the water temperature is high, but it needs to run continuously when the air conditioning is on, which significantly increases the noise. If the fan becomes unbalanced due to dirt accumulation, the noise becomes even louder, accompanied by body vibration. 2. Blower motor: The noise originates from the air conditioning blower motor. When the blower motor bearings are worn or lack lubrication, it can produce a sharp noise. Another cause is not replacing the air filter in time, leading to dust accumulation and imbalance, which can also cause resonance and abnormal noise. 3. Compressor belt: The noise comes from the air conditioning compressor belt. When the air conditioning is turned on, the compressor engages, increasing the load on the belt. If the belt is loose or aged, it can produce abnormal noise.

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DiMaverick

08/12/25 3:24am

My Peugeot 408 has been making a squeaking noise when the AC is on recently, and the issue could stem from multiple parts of the AC system. It's quite common for the compressor to make noise upon startup, usually due to worn internal bearings or insufficient lubrication—this causes a squeaking sound when the compressor operates, especially noticeable during frequent use on hot days. A loose or aged belt can also create friction-related noises. Last time I checked myself, I traced the sound to the front of the engine bay and confirmed it was a belt issue. Dust buildup or deformation of the fan motor blades might also lead to a whirring noise, so remember to clean the fan regularly to prevent blockages. If the noise gets progressively louder, it's best not to tough it out—get it inspected by a professional shop promptly to check the compressor or replace parts. Delaying repairs could damage the entire system, costing more time and money. For older vehicles, also inspect whether the AC lines are loose or leaking—a simple tightening might restore quiet operation.

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