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What are the causes of abnormal noise in the Passat's air conditioning system?

2 Answers

Myra

07/29/25 3:33pm

There may be several reasons for abnormal noise in the Passat's air conditioning system: Dirty air filter: A dirty air filter can cause excessive noise and abnormal sounds. Debris in the blower fan blades: Debris in the blower fan blades can lead to abnormal noise. You can test this by turning on the blower without starting the engine. If the noise appears, it confirms an issue with the blower. Fan problems: Deformed fan blades or a damaged fan motor in the car's air conditioning system. Worn clutch bearing: Wear in the clutch bearing inside the air conditioning compressor can cause increased engine noise when the air conditioning is on. This component cannot be replaced separately and requires the replacement of the entire air conditioning pump assembly.

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ZaneFitz

08/14/25 9:11am

I've encountered strange noises from the air conditioning in my Passat several times. The sound is like something stuck in a rotating fan, a buzzing noise that's really annoying. Possible causes include loose or worn blades in the blower fan - unbalanced rotation creates noise; or the AC compressor lacking lubricant, causing excessive internal friction; sometimes a loose belt squeals upon startup. The check method is simple: first turn off the AC and listen - if the noise persists, it's likely the blower fan; if it stops immediately, it's probably the compressor or refrigerant issue. I recommend visiting the 4S shop soon, otherwise the noise will worsen, affecting driving mood and potentially damaging other components, leading to costly and time-consuming repairs. Regular maintenance should include replacing the cabin air filter - smooth airflow reduces noise probability. After all, the Passat's AC system is quite sophisticated and requires proper maintenance.

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