Really loud whirring

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Old 04-22-2019, 03:55 PM
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Join Date: Apr 2019
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Question Really loud whirring

I guess it's the belt. I can't tell when I'm riding - it comes from the engine, or I guess the belt. It whirrs whenever I'm not accelerating. When I'm decelerating, it's loud - comically loud.
It's a new 2018 S40 - 150 miles, and whirred from the start. The agency mechanic says it's normal. eh
I'd like to try to figure out what is wrong, before putting grease or anything on the belt.
Thanks for any leads.
Lolocowboy
 
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