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AC Compressor Noise 2008 S80 D5

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Old Oct 20th, 2017, 23:01   #11
Semnoz
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Quote:
Originally Posted by Bryan Rooney View Post
I think the AC guys thoughts were that the load of the compressor could expose a worn pulley/bearing elsewhere on the belt.

To that effect I poured a small amount of water on the belt with the AC on and the noise stops momentarily - more water and it stops again.

Might this suggest an issue with another component? Not an internal issue with the compressor?
Can you clarify what type of noise you're hearing, as I can't see how wetting a pulley belt eliminates the noise of a compressor problem.
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Old Oct 21st, 2017, 13:14   #12
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If the water produces slippage between the belt and the resistant failing unit, the binding surfaces with momentarily stop moving against each other and the noise will stop. The problem with using this diagnostic is that if there is more than one unit being driven by the belt it will not tell you which one is grinding itself to death.

I don't know if the drive pulley is dual mass with a rubber buffer section bonded in between the pulley hub and the rim, but if that is the case, it is worth checking that the bonding has not parted whether there is slippage between the rubber layer and one of the metal layers making the sort of squeal that tyres make on shiny car park floors. The diagnostic application of water would also lubricate that and stop it squealing. A chalk mark across all three layers when stationary will no longer align if slippage is taking place. If the drive pulley is wholly metal, this will not apply.
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Old Oct 23rd, 2017, 19:51   #13
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My air con is noisy it's sounds like a bearing rough sort noise from the drivers seat and can hear a whine at certain speeds. The noise/whine disappears as soon as the air con is switched off.

The noise almost sounds like is from behind the dashboard, had the system re gassed so not low on gas. When I switch air con on you can sometimes here a sort of whooshing gurgling noise from behind the dash.

Dis you get yours sorted?
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Old Oct 31st, 2017, 20:54   #14
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This is doing head in can not pin point the noise, surely if it was the compressor it would be noisy all the time.

What's this purge valve I've heard mentioned somewhere? Could that make the noise I have?

Did the 2008 car get sorted?
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Old Nov 4th, 2017, 12:38   #15
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sounds like a bearing rough sort noise from the drivers seat and can hear a whine at certain speeds. The noise/whine disappears as soon as the air con is switched off.

The noise almost sounds like is from behind the dashboard
I have (almost) exactly this in my new to me 2008 XC90. The exception being that the bearing noise (kind of a buzz) doesn't happen all the time but the whine/whistle does. Stops within 30 secs of turning the AC off. Not audible outside the car and often not when idling. Most apparent around 30-40 MPH. I initially thought it might be the blower motor because the noise sounds as if it is from behind the dash and vents but it is linked to whether the AC is running, not the fan speed.

The car is currently with the supplying Volvo dealer for them to investigate and correct. If I get any joy I'll update this thread.
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Old Nov 4th, 2017, 12:56   #16
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Yes a whining noise, sounds like a gearbox whine which increases with engine revs. Noise stops when you switch off the ac.

I think it is the expansion valve after reading many reports online? going to try and find it later and see if I can here noise from it.

Look forward to see what Volvo say about your car.
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Old Nov 9th, 2017, 16:10   #17
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Update: Three weeks later, the supplying Volvo dealer has decided that it is the compressor. This might be so, I have no better theory to offer nor reason to doubt.

They have also decided that this is 'normal' for a car of this age and so won't be doing anything about it. I disagree.

I've asked the Volvo dealership that I more usually use for their thoughts on the probable cause, and an estimated cost for replacement of the compressor.

Anyone else have any ideas? It might seem a trivial issue but it's one of those noises that once you're aware of its existance becomes very annoying, very quickly.
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Old Nov 9th, 2017, 16:31   #18
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i have been under my dash and found the pipes that come in from the bulkhead from the expansion valve. The pipes look to have a plastic surround on them, putting pressure on the pipes dulls the noise so it must be how it is or its the valve.

I have put a cable tie around the pipes and tied to a place nearby so there is constant slight pull on the pipes. I have also put foam around the area to help quieten the noise, seems to be better. I will have to get some more insulation and really pack that area.
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Old Nov 12th, 2017, 15:17   #19
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I think you are on to something. In the absense of any further contact to date by either Volvo dealership (obviously making too much money at present) I've continued researching on Google myself.

The SAE has this paper online which I think, in conjunction with your findings, probably answers the question and confirms what you and others have said regarding the expansion valve. http://papers.sae.org/2015-01-2275/

From the abstract:

"In the thermal expansion valve (TXV) refrigerant system, transient high-pitched whistle around 6.18 kHz is often perceived following air-conditioning (A/C) compressor engagements when driving at higher vehicle speed or during vehicle acceleration, especially when system equipped with the high-efficiency compressor or variable displacement compressor"

Yup, mine is high-pitched and 'provoked' into being louder by accelerating. The compressors Volvo use are of the variable displacement type.

"the whistle is generated from the flow/acoustic excitation of the turbulent flow past the shallow cavity, reinforced by the acoustic/structural coupling between the tube structural and the transverse acoustic modes, and then transmitted to evaporator"

So when the A/C is off, no refridgerant flow = no noise. The noise is being transmitted by the physical elements (refridgerant lines) to the evaporator coil in the climate unit, so that's why it is heard from behind the dash and from the vents.

I suggest that your cable-tie and packing works to damp out some of the vibration in the lines, quieting it down.

In short - thanks for taking the time to experiment and feed back. I think I will instruct my usual garage to forget diagnostics and just replace the expansion valve and re-charge, not mess around with the compressor.

That said, whilst it looks as if the cost of a new expansion valve is about a tenth of that of an exchange compressor, what's the betting that the dash has to come out and labour costs are massive..
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Old Nov 12th, 2017, 16:35   #20
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I have seen the expansion valve on mine is sits in the bulkhead beneath the exterior scuttle panel where the wipers are not far from the port is to recharge the air con.

I may order a new valve and replace, but I did read somewhere that it was software controlled? So changing may be a waste of time.
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