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C30 / S40 & V50 '04-'12 / C70 '06-'13 General Forum for the P1-platform C30 / S40 / V50 / C70 models |
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Faint high pitched noiseViews : 696 Replies : 5Users Viewing This Thread : |
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#1 |
New Member
Last Online: Sep 7th, 2014 00:03
Join Date: Dec 2013
Location: Birmingham
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Hi all
I’ve recently bought an ’07 C30 D5 with 36k miles, and it’s making a very quiet high pitched noise. There seems to be no correlation between speed or revs and the noise, and it happens in motion and when stationary. It happens maybe 50% of the time, and seems to build, and then suddenly stop. It’s RHD, and it sounds as though it’s coming from the front right, but I am not certain of that. It sounds either like a belt whirring, and then suddenly going back into place, or air gradually escaping, and then stopping. Any ideas? I expect it’s probably nothing, but I want to be sure whilst the car is still in warranty. |
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#2 |
Member
Last Online: May 10th, 2016 14:53
Join Date: Nov 2008
Location: Rogaland
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Does the sound go away if you pull the oil dipstick or the oil fill cap?
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#3 |
Junior Member
Last Online: Aug 10th, 2019 18:39
Join Date: Aug 2011
Location: Sheffield
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Try turning the AC/blowers off and see if the sound stops. (When mine is on it makes a faint high pitched noise).
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#4 |
New Member
Last Online: Sep 7th, 2014 00:03
Join Date: Dec 2013
Location: Birmingham
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Nope, but it does make an unsettling gurgling noise!
It's definitely not the air con, it's still there if the air con is off. |
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#5 |
Member
Last Online: May 10th, 2016 14:53
Join Date: Nov 2008
Location: Rogaland
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So you didnt try pulling the dip stick..
It will eliminate the most common source of engine howl on these newer volvos, spilt diaphragm in the crankcase ventilation. |
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#6 |
Senior Member
Last Online: May 11th, 2017 15:34
Join Date: Nov 2007
Location: lincolnshire
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