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Noisy air con

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Old Nov 25th, 2020, 00:27   #11
Kev0607
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Originally Posted by 37 RUBY View Post
Whilst not dismissing the above advice (my own car has that exact foible) have you actually had a gander under the bonnet, and with engine off grasped the air con pulleys and tensioners to check for play or used a long screwdriver as a listen stick on the aircon pump casing when it's running.?

You wouldn't want to ignore a failing bearing, which might seize and snap a belt, what with the propensity of your engine to spit its dummy when an errant belt gets behind the timing case.
I haven't tested the pulleys, or tried the trick with a screwdriver. I'll give that a go this weekend to see if I find anything suspect.

An independent Volvo garage replaced the timing belt for me last year. I replaced the aux belt, a/c belt & tensioner myself last year too (All genuine Volvo parts).

I guess this is something for my local independent to have a look at. If it is the compressor that's the problem, I haven't got the equipment to evacuate the gas anyway. I might as well let him do that, as the car will be going to him anyway. Replacing a compressor is not something I fancy, or am equipped to do in terms of evacuating the system.

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Originally Posted by Bonefishblues View Post
It's the compressor. Diagnosed by a well-regarded Indy. Suggested on here when I was discussing aftermarket (new) replacements. Bought a low-miles OEM replacement in great nick from a well-regarded vendor, also local, and the replacement does it too!

Hey-ho, put it down to experience and all that.
Assuming that the compressor is the issue with my car, its best to buy a new one? How much are we talking?
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Last edited by Kev0607; Nov 25th, 2020 at 01:27.
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Old Nov 25th, 2020, 11:59   #12
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Assuming that the compressor is the issue with my car, its best to buy a new one? How much are we talking?
I'd go for a new one. They are available from around £200 upwards. A new dryer should be fitted at the same time. Allow another £50 or so for that.

Make sure whoever fits it knows what they are doing. I had a new compressor fitted to another vehicle a few years ago. The fitters didn't know that it needed to be charged with oil. It failed a short while later, and spat out metal throughout the air con system. The entire system needed to be replaced - condenser, evaporator, pipework - plus of course the compressor
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Old Nov 25th, 2020, 12:23   #13
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Originally Posted by Kev0607 View Post
I haven't tested the pulleys, or tried the trick with a screwdriver. I'll give that a go this weekend to see if I find anything suspect.

An independent Volvo garage replaced the timing belt for me last year. I replaced the aux belt, a/c belt & tensioner myself last year too (All genuine Volvo parts).

I guess this is something for my local independent to have a look at. If it is the compressor that's the problem, I haven't got the equipment to evacuate the gas anyway. I might as well let him do that, as the car will be going to him anyway. Replacing a compressor is not something I fancy, or am equipped to do in terms of evacuating the system.



Assuming that the compressor is the issue with my car, its best to buy a new one? How much are we talking?
I paid £100+ for an OEM as said, Autodoc will supply new for c£200 upwards, but, on exchange, the OEM under its maker's name (which I forget) is not far North of that - trouble is it's a heavy thing to ship to Munich, which increases the cost
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Old Nov 26th, 2020, 12:17   #14
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If there is a very small leak, you'll eventually reach a gas level where the system still works, but the compressor squeaks. It's a whining noise that follows engine speed and goes avay if you turn AC off, of course. Happened to me last year (after 300000 km). A new condensor took care of the leak. The noise returned after a few weeks. Turned out the mechanic had failed to verify that the filling valve was tight after refilling the system. That fixed, then no problem.

Frequent use of the system tends to be better for longevity than sporadic use. Keep the AUTO mode active at all times.
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Old Nov 26th, 2020, 16:35   #15
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If there is a very small leak, you'll eventually reach a gas level where the system still works, but the compressor squeaks. It's a whining noise that follows engine speed and goes avay if you turn AC off, of course. Happened to me last year (after 300000 km). A new condensor took care of the leak. The noise returned after a few weeks. Turned out the mechanic had failed to verify that the filling valve was tight after refilling the system. That fixed, then no problem.

Frequent use of the system tends to be better for longevity than sporadic use. Keep the AUTO mode active at all times.
That's very interesting. I wonder if that's my real issue? I've got the original compressor that was taken off. How to check if that might have been the source of the issue - presume the clutch gap issue and this would be one and the same thing?
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Old Nov 29th, 2020, 09:22   #16
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Interesting thread I’d like to add a few points:

- it was never going to be the pulley bearing on the compressor - that spins constantly whether the a/c is on or off. If you had a constant noise that followed engine speed the it may have been bearing.

- it’s been said and I’ve seen it a few times when a/c systems get low on gas they are whiny and noisey, which gets worse after it’s been running a few minutes. A good, honest a/c engineer will be able to detect this with his gauges.

- there is a known issue on some Volvo’s circa 2010-2015 where noise comes from a valve in the system, there is a technical bulletin for it.

- I would be another advocate of using second hand genuine compressors rather that new pattern parts. I’ve no experience specifically to back that up other than my general frustration with the mediocre quality of pattern parts in the trade currently (driven by consumers wanting lower price in preference of quality)
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Last edited by Tannaton; Nov 29th, 2020 at 09:25.
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Old Nov 29th, 2020, 09:48   #17
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Originally Posted by Tannaton View Post
Interesting thread I’d like to add a few points:

- it was never going to be the pulley bearing on the compressor - that spins constantly whether the a/c is on or off. If you had a constant noise that followed engine speed the it may have been bearing.

- it’s been said and I’ve seen it a few times when a/c systems get low on gas they are whiny and noisey, which gets worse after it’s been running a few minutes. A good, honest a/c engineer will be able to detect this with his gauges.

- there is a known issue on some Volvo’s circa 2010-2015 where noise comes from a valve in the system, there is a technical bulletin for it.

- I would be another advocate of using second hand genuine compressors rather that new pattern parts. I’ve no experience specifically to back that up other than my general frustration with the mediocre quality of pattern parts in the trade currently (driven by consumers wanting lower price in preference of quality)
Is this available so I can point at it when I take it to Brer AC Man?
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Old Dec 4th, 2020, 00:28   #18
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I was driving my Dad's V70 (57 plate) recently & his A/C makes the exact same noise as mine does when the climate control is set to "auto".
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Old Dec 9th, 2020, 00:49   #19
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I happened across this interesting video...

https://m.youtube.com/watch?v=WPH8cK_eo14

...still on topic and worth a look inside the reservoir.
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Old Dec 10th, 2020, 22:59   #20
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I happened across this interesting video...

https://m.youtube.com/watch?v=WPH8cK_eo14

...still on topic and worth a look inside the reservoir.
Interesting video, but its definitely an a/c noise on my car & nothing to do with the power steering.
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