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Barely audible buzzing sound - car is off?
My mom's 04 Impala just had the battery replaced. Previously, the car did not start on two separate occasions (it was intermittent).
Since she's had the car (less than 1,000 miles) it has always made a low hissing or buzzing sound even when the car is off. It seems to come out of the AC/heater vents or somewhere close-by. It is so low that some people cannot hear it. My mom and I can hear it just fine.
We are wondering if something may be draining the battery, which might explain the root cause of the aforementioned problem.
What could be the root of this noise?
My car knowledge is somewhat elementary, so I can't do much, but if there is anything that I can check on my own I will try.
Thank you for any suggestions,
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