V70: General - A/C noise

staaf · May 15th, 2019, 11:21

Hi,

Does anybody recognise this noise?
https://youtu.be/h4Zwtg9ZB_o
The dealer has no idea whats causing the noise.
The system is vacumed and filled with 770gr gas.
The noise disapears when te AC is switched off.

What is done/new:
-new idler pulley
-new alternator bearings
-new serpentine belt and pulleys
-new distribution belt, and pump (twice)
-new powersteering pump + fluid
-new engine mounts
-new ac compressor
-new condensor
-new pressure sensor (AC circuit)
-new expansion valve

Everything looks right, hp pressure seems ok, no errors in vida.
Just that noise that is going up/down with the revs.
It seems that the noise enter the cars interior through te presurelines and the evaporator.

The car is a my2009 v70III, 2.4d

Anybody an other idea?

Spike56 · May 15th, 2019, 19:37

No idea what it is but I have a similar noise! Does it stop when you turn the a/c off? I have assumed that it is a bearing somewhere......

kenny · May 15th, 2019, 20:14

I had the same noise after fitting a new compressor. the clutch on the original one seized which is a common issue. I had a local company who I know to be very good fit an OEM one and I was left with this noise. He thought it was due to low gas but the levels were correct and trying to over fill it didn’t help neither did a second compressor. Ended up living with it as car was due to be upgraded.

staaf · May 15th, 2019, 20:51

The noise disappears when the AC is turned off.
I don't really think it's a bearing issue, my personal thought after changing all the parts that i mentioned above is that something is resonating.
I really don't have any idea where I can find the solution. I've spent hours and hours searching for something that I can't find.

Spike56 · May 15th, 2019, 23:54

It's a Volvo!
Likewise mine whines, up and down with the revs, so it is obviously from the a/c mechanical system and is speed related. Comes only with the a/c on. So either belt, clutch or a bearing. It does occasionally stop but only for a short while.
Very odd.

staaf · May 16th, 2019, 06:17

I replaced all that stuff, every bearing ( pulleys, idler, alternator bearings, powersteering pump, compressor, coolant pump, distribution pulleys etc.....)

staaf · May 16th, 2019, 15:20

Alternator has new bearings, slip ring, regulator and brushes.

cheshired5 · May 16th, 2019, 15:24

Quote:

Originally Posted by staaf

Alternator has new bearings, slip ring, regulator and brushes.

Does it have a new clutch pulley?
Has the alternator pulley been tested?

staaf · May 16th, 2019, 15:52

I guess you mean the clutch pulley from the compressor? Yes, it came with a new one.
The alternator pulley is also new (ina) and is tested.

Thanks for all the people who share their thoughts.

cheshired5 · May 16th, 2019, 16:07

Quote:

Originally Posted by staaf

I guess you mean the clutch pulley from the compressor? Yes, it came with a new one.
The alternator pulley is also new (ina) and is tested.

Thanks for all the people who share their thoughts.

No I meant the clutch pulley on the alternator.
If a non clutch pulley has been fitted to the alternator, it will stress the belt and other pulleys and create noise.

The exact part number of the pulley fitted to the alternator would be useful to confirm.

May 15th, 2019, 11:21	#1
staaf New Member Last Online: Apr 16th, 2024 20:04 Join Date: Feb 2014 Location: dendermonde	A/C noise Hi, Does anybody recognise this noise? https://youtu.be/h4Zwtg9ZB_o The dealer has no idea whats causing the noise. The system is vacumed and filled with 770gr gas. The noise disapears when te AC is switched off. What is done/new: -new idler pulley -new alternator bearings -new serpentine belt and pulleys -new distribution belt, and pump (twice) -new powersteering pump + fluid -new engine mounts -new ac compressor -new condensor -new pressure sensor (AC circuit) -new expansion valve Everything looks right, hp pressure seems ok, no errors in vida. Just that noise that is going up/down with the revs. It seems that the noise enter the cars interior through te presurelines and the evaporator. The car is a my2009 v70III, 2.4d Anybody an other idea? Last edited by staaf; May 15th, 2019 at 11:24.

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May 15th, 2019, 19:37	#2
Spike56 Master Member Last Online: Today 13:42 Join Date: Feb 2013 Location: Orpington	No idea what it is but I have a similar noise! Does it stop when you turn the a/c off? I have assumed that it is a bearing somewhere......

May 15th, 2019, 20:14	#3
kenny Master Member Last Online: Dec 16th, 2020 20:33 Join Date: May 2009 Location: kirknewton	I had the same noise after fitting a new compressor. the clutch on the original one seized which is a common issue. I had a local company who I know to be very good fit an OEM one and I was left with this noise. He thought it was due to low gas but the levels were correct and trying to over fill it didn’t help neither did a second compressor. Ended up living with it as car was due to be upgraded.

May 15th, 2019, 20:51	#4
staaf New Member Last Online: Apr 16th, 2024 20:04 Join Date: Feb 2014 Location: dendermonde	The noise disappears when the AC is turned off. I don't really think it's a bearing issue, my personal thought after changing all the parts that i mentioned above is that something is resonating. I really don't have any idea where I can find the solution. I've spent hours and hours searching for something that I can't find.

May 15th, 2019, 23:54	#5
Spike56 Master Member Last Online: Today 13:42 Join Date: Feb 2013 Location: Orpington	It's a Volvo! Likewise mine whines, up and down with the revs, so it is obviously from the a/c mechanical system and is speed related. Comes only with the a/c on. So either belt, clutch or a bearing. It does occasionally stop but only for a short while. Very odd.

May 16th, 2019, 06:17	#6
staaf New Member Last Online: Apr 16th, 2024 20:04 Join Date: Feb 2014 Location: dendermonde	I replaced all that stuff, every bearing ( pulleys, idler, alternator bearings, powersteering pump, compressor, coolant pump, distribution pulleys etc.....)

May 16th, 2019, 15:20	#7
staaf New Member Last Online: Apr 16th, 2024 20:04 Join Date: Feb 2014 Location: dendermonde	Alternator has new bearings, slip ring, regulator and brushes.

May 16th, 2019, 15:52	#9
staaf New Member Last Online: Apr 16th, 2024 20:04 Join Date: Feb 2014 Location: dendermonde	I guess you mean the clutch pulley from the compressor? Yes, it came with a new one. The alternator pulley is also new (ina) and is tested. Thanks for all the people who share their thoughts.

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