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Whining noise when accelerating if AC is on

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Old 06-15-2017 | 10:14 PM
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c3002008's Avatar
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C300, ML350
Whining noise when accelerating if AC is on

I am getting a whining noise when AC is on and its gets louder in pitch when I accelerate, this occurs when the compressor kicks in. What could be the possible cause?
Old 06-15-2017 | 10:30 PM
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2016 GLC300 Dakota Brown on Espresso Brown Leather, 2014 C250 Sport Diamond Silver
Originally Posted by c3002008
I am getting a whining noise when AC is on and its gets louder in pitch when I accelerate, this occurs when the compressor kicks in. What could be the possible cause?
Slipping drive belt/bad tensioner pully or bearing
Old 06-16-2017 | 05:48 AM
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From: 1 hours drive north of Sydney Australia
2007 W204 220CDI Classic Sedan
I have had a whining noise from the AC when on & lightly loaded ie not a hot day. It has been there for years. The A/C works perfectly. A/C mechanics say I could add gas & it may fix it. I have not bothered.

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