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Discussion Starter · #1 ·
I think that ever since I've had my 2009 S40 T5 AWD, I've noticed that there is a whirring sound when slowing down from around 30-40 MPH. It does not appear to be related to the engine itself because the RPMs are at/near idle when braking. Just for grins I put the car in Neutral while slowing down and the sound went away. No messages, CEL, or any other abnormal behavior.

Is this a normal sound? Guessing it is from the transmission but I'm not sure...
 

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I have that same sound, and asked my dealer about it when I was in for some warranty work. They said it was totally normal.
 

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I think it's a spindown of a fan or belt or something when the brakes are applied and RPMs drop.
 

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I think it's trans-related as well. Either way, they assured me it was fine.
 

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There's no mechanical fan. I believe it's the trans
 

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I was thinking radiator fan.
 

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Discussion Starter · #10 ·
Checked with the service advisor when dropping the car off for its 52.5K service and he said it was the engine braking from the transmission...doesn't entirely agree with what I see on the tachometer but it makes sense.
 
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