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Hum in my '09 C300

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Old 01-23-2015, 05:08 PM
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'09 300C LUX & GTI 2014
Hum in my '09 C300

Bought a used '09 C300 a month ago and now I notice a high pitched hum at around 40 mph. The sound is not loud and so I didn't notice as the sales guy and I were yakking during the test drive. It goes away when I let off on the gas hence I'm wondering some kind of transaxle(?) issue or bearing issue.
If I go to dealer he'll say it's wind noise but I think not. Car has 64K on it and I have a 3 year CPO deal on it when I bought the car in 12/14.
Thoughts?
And lastly is there any way to play music from my Iphone6 via the cars sound system through some aftermarket mod? Car does not have nav or upgraded stereo.
Old 01-23-2015, 10:39 PM
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2014 C300 Luxury
I would take it to a dealer and get them looking into the whine at speed. You have a warranty so you shouldn't have to be concerned about the cost of the repairs.

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