Faint high pitched noise

axw820 · Jul 28th, 2014, 12:55

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.

gswede · Jul 28th, 2014, 14:44

Does the sound go away if you pull the oil dipstick or the oil fill cap?

MrRich · Jul 28th, 2014, 17:24

Try turning the AC/blowers off and see if the sound stops. (When mine is on it makes a faint high pitched noise).

axw820 · Jul 28th, 2014, 19:48

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.

gswede · Jul 28th, 2014, 20:25

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.

TEZ-1 · Jul 29th, 2014, 10:03

Is it like this noise.

http://www.youtube.com/watch?v=xZH1xei0-b0

Jul 28th, 2014, 12:55	#1
axw820 New Member Last Online: Sep 7th, 2014 00:03 Join Date: Dec 2013 Location: Birmingham	Faint high pitched noise 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.

Jul 28th, 2014, 14:44	#2
gswede Member Last Online: May 10th, 2016 14:53 Join Date: Nov 2008 Location: Rogaland	Does the sound go away if you pull the oil dipstick or the oil fill cap?

Jul 28th, 2014, 17:24	#3
MrRich Junior Member Last Online: Aug 10th, 2019 18:39 Join Date: Aug 2011 Location: Sheffield	Try turning the AC/blowers off and see if the sound stops. (When mine is on it makes a faint high pitched noise).

Jul 28th, 2014, 19:48	#4
axw820 New Member Last Online: Sep 7th, 2014 00:03 Join Date: Dec 2013 Location: Birmingham	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.

Jul 28th, 2014, 20:25	#5
gswede Member Last Online: May 10th, 2016 14:53 Join Date: Nov 2008 Location: Rogaland	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.

Jul 29th, 2014, 10:03	#6
TEZ-1 Senior Member Last Online: May 11th, 2017 15:34 Join Date: Nov 2007 Location: lincolnshire	Is it like this noise. http://www.youtube.com/watch?v=xZH1xei0-b0

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