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#4574869 - 11/15/17 11:20 AM volvo hum (no not the song!) 2009 C70
cudavid Offline


Registered: 01/21/09
Posts: 17
Loc: RI
Ok, wife's car, 65K , shares same platform as the 40 and 50 / 60 Volvo series cards I think.
Humming noise getting louder in past 6 months. I bet front wheel bearings and planned them some day, well then BOTH axle boots split between oil changes and spewed grease, ok, do new high quality GNK axles and SKF bearings(OEM), at same time.
No real change!

Ok must be tire noise, 25K on tires, did rotate again, no change, ok, screw it, new tires, no change!
Back wheel bearings feel fine, but will do them this weekend.
If this fails what next!. GRRRR

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#4574886 - 11/15/17 11:41 AM Re: volvo hum (no not the song!) 2009 C70 [Re: cudavid]
meep Online   content


Registered: 02/20/07
Posts: 3549
Loc: Southeast
does hum:
change with speed?
change with engine rpm?
change with gear?
change with load?
do it in neutral?
change with steering input?
change with brake input?
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#4574887 - 11/15/17 11:42 AM Re: volvo hum (no not the song!) 2009 C70 [Re: cudavid]
mk378 Offline


Registered: 09/27/15
Posts: 1414
Loc: USA
If you can hear it at low speed, stand outside the car and have someone drive past you while you listen to try to localize the noise source.

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#4574925 - 11/15/17 12:25 PM Re: volvo hum (no not the song!) 2009 C70 [Re: cudavid]
AndyB Online   content


Registered: 11/08/15
Posts: 12
Loc: St.Cloud MN.
Possible to jack up car and put on jack stands? You could then run it in gear and pinpoint the sound?

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#4574944 - 11/15/17 12:47 PM Re: volvo hum (no not the song!) 2009 C70 [Re: cudavid]
Lolvoguy Online   sleepy


Registered: 02/06/14
Posts: 2327
Loc: Canada
Just make sure it's not coming from the engine.
If it's noticeable when the car is idling in place, I'd seriously suggest looking into getting the PVC system REPLACED. Failure to do so will result in blown engine seals.
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#4575092 - 11/15/17 02:54 PM Re: volvo hum (no not the song!) 2009 C70 [Re: cudavid]
14Accent Offline


Registered: 08/03/17
Posts: 390
Loc: MN
Does the passenger side axle have a stub shaft with a carrier bearing? That's my bet if it does.

*edit* Looks like the axle and bearing are one piece. Scratch that. I would look into the PCV as well. With the engine running and the noise happening, pull the oil cap. Is there excessive vacuum? Does the noise stop?


Edited by 14Accent (11/15/17 02:56 PM)
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