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I have two different a/c related "whine" sounds. The first sound is very high pitched, changes with RPM's and can be heard at idle from within the cabin. Sounds like an older car with a bad alternator whine. Dealer says "normal".
Second whine is much lower in tone and most noticeable around 2800 to 3000 RPM's. Especially prevalent when you take your foot off the gas and allow it to slow down. Stops when you turn off the air conditioning. Also described by dealer as "normal".
Others have solved their whine problems with a/c replacement. Guess mine will have to fail completely in order to make that happen. Good luck.
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