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A whistling sound when the air conditioning is on in your 2012 Avalanche could be caused by several factors, including a clogged cabin air filter, which restricts airflow and can create a whistling noise. Additionally, it may be due to a leak in the ductwork or an issue with the blower motor. It's also possible that the noise is coming from the AC compressor or other components in the system. A thorough inspection by a qualified mechanic can help identify and resolve the issue.

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