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Q: at 30 mph a loud motor noise is heard on 2008 Chevrolet HHR SS

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
It started two days ago, while driving when I reach about 30 mph this noise starts that sounds like a wide open outboard motor. What could this be? Turning on or off the a/c fan does nothing.
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