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GL Class (X166) 2013-2015 after facelift became GLS (X166)

can anyone help me out with this sound?

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Old 01-02-2019, 04:58 PM
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can anyone help me out with this sound?

Here's a video of the sound, if you listen it's like it rattles almost like the belt is loose, any ideas?
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Old 01-02-2019, 05:52 PM
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My guess would be one of the pulleys has a worn bearing..
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Old 01-02-2019, 07:59 PM
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Sounds like the water pump when it was going bad on my '13 Dodge Durango hemi at 30k miles.
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Old 01-02-2019, 08:16 PM
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Hard to tell, could be timing chain, or a pulley bearing you need to use a hose or stethoscope to listen to the areas and localize the sound.
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