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Home > Technical > AC noise ++ Where is it coming from? SOLVED
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jules



Member Since: 13 Dec 2007
Location: The Wilds of Warwickshire
Posts: 4965

United Kingdom 2014 Freelander 2 SD4 SE Auto Firenze Red

@Ian I sometimes ask my wife if the noise I can hear is actually real or just my tinnitus Laughing

Its been suggested (pub discussion) that turning the AC on alters the tension in the Aux belt and maybe alters the loading on the Alternator pulley.

On balance I'll start by changing the alternator pulley.

Can it be done with the alternator in situ ? Jules

Post #443898 5th Aug 2024 2:48 pm
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jules



Member Since: 13 Dec 2007
Location: The Wilds of Warwickshire
Posts: 4965

United Kingdom 2014 Freelander 2 SD4 SE Auto Firenze Red

But the Aux belt is NOT flapping or bouncing which is the usual sign of a failing Alternator pulley.



What do people think ? Jules

Post #443900 5th Aug 2024 3:02 pm
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jules



Member Since: 13 Dec 2007
Location: The Wilds of Warwickshire
Posts: 4965

United Kingdom 2014 Freelander 2 SD4 SE Auto Firenze Red

jules wrote:
@Ian I sometimes ask my wife if the noise I can hear is actually real or just my tinnitus Laughing

Its been suggested (pub discussion) that turning the AC on alters the tension in the Aux belt and maybe alters the loading on the Alternator pulley.

On balance I'll start by changing the alternator pulley.

Can it be done with the alternator in situ ?


Yes it can

https://www.freel2.com/forum/topic25448.ht...tor+pulley

You need an M10 spline for the inner part and a 33 spline for the outer (about £5 from ebay).

However using an M10 spline I can turn the alternator easily one way but not the other, so the alternator Overrun Pulley (OAP) is not seized.

So, in my humble opinion, its coming down to the either AC compressor clutch pulley or the compressor bearing themselves.

Most people say the clutch pulley rattles at idle which mine doesnt. So its looking more like compressor bearings.

Do you have to get the AC system de-gassed before removing the compressor ?
Is it worth changing the compressor clutch first ? Jules

Post #443901 5th Aug 2024 3:58 pm
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rsash



Member Since: 20 Jan 2015
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Wales 2014 Freelander 2 TD4 SE Manual Orkney Grey

Mine has the same noise, been diagnosed as a bearing in the A/C unit which cannot be replaced (not available I believe). The whole unit will need to be changed. Although the noise is irritating i'll wait until it is unbearable.

Post #443904 5th Aug 2024 7:40 pm
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jules



Member Since: 13 Dec 2007
Location: The Wilds of Warwickshire
Posts: 4965

United Kingdom 2014 Freelander 2 SD4 SE Auto Firenze Red

Thanks
The it seems that its most likely to be the compressor itself.

A replacement compressor clutch isnt a huge amount cheaper than a new compressor with clutch so Im thinking of changing the lot. Jules

Post #443906 5th Aug 2024 10:07 pm
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Dave47



Member Since: 31 Aug 2014
Location: Margate Kent
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United Kingdom 2008 Freelander 2 TD4 SE Auto Izmir Blue

Could it be valve failure in the A/C compressor it's self,
Mine was making strange noises about 3 years back and my
A/C man replaced it, said he's had only 2 go like this. DAVE.

Post #443909 6th Aug 2024 9:06 am
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IanMetro



Member Since: 11 Sep 2017
Location: Somerset BS21
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United Kingdom 2014 Freelander 2 SD4 Metropolis LE Auto Fuji White

IanMetro wrote:
The clip of you revving the engine sounds like Alternator Belt being stressed on the overrun, although I would also expect it to be there with AC off.
Is the noise in proportion to the pressure inside the AC unit perhaps?


A valve reacting to internal pressure would match what I thought I could hear, although changing the whole unit out should cover all possibilities. FL2 XS SD4 Auto 2010 2012-2017 (21k - 91k miles) (MY2011)
FL2 Metropolis SD4 Auto 2014 2017- (16k - 77k+ miles) (MY2015)
Metro in its 11th Year of (Extended) LR Warranty / Full LR Service History
(Expensive, but Trouble/Worry free - hopefully?)

Post #443911 6th Aug 2024 10:45 am
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jules



Member Since: 13 Dec 2007
Location: The Wilds of Warwickshire
Posts: 4965

United Kingdom 2014 Freelander 2 SD4 SE Auto Firenze Red

Im awaiting tomorrow's visit from the AC man.

I thought I'd help by improving access to the condenser etc.
Access to the drier plug is blocked by the radiator/condenser/intercooler support bracket.

Click image to enlarge


Click image to enlarge
 Jules

Post #444113 16th Aug 2024 8:33 pm
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jules



Member Since: 13 Dec 2007
Location: The Wilds of Warwickshire
Posts: 4965

United Kingdom 2014 Freelander 2 SD4 SE Auto Firenze Red

New AC compressor installed, flushed and regassed + lube. All lovely and quiet now.

The noise was definitely from the compressor bearings.

The chaps from CoolCarAirCon were very good. Knocked £150 off the bill for the prep work I had done. Which was nice.

So new AC compressor, aux (FEAD) belt pulleys, fitting and de-gassing & re-gassing = £440 Jules

Post #444132 17th Aug 2024 5:42 pm
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IanMetro



Member Since: 11 Sep 2017
Location: Somerset BS21
Posts: 3111

United Kingdom 2014 Freelander 2 SD4 Metropolis LE Auto Fuji White

Glad you got it solved.

Also another successful outcome for the Forums Search function to find when we need it. FL2 XS SD4 Auto 2010 2012-2017 (21k - 91k miles) (MY2011)
FL2 Metropolis SD4 Auto 2014 2017- (16k - 77k+ miles) (MY2015)
Metro in its 11th Year of (Extended) LR Warranty / Full LR Service History
(Expensive, but Trouble/Worry free - hopefully?)

Post #444133 17th Aug 2024 6:46 pm
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jules



Member Since: 13 Dec 2007
Location: The Wilds of Warwickshire
Posts: 4965

United Kingdom 2014 Freelander 2 SD4 SE Auto Firenze Red

Yes, we cable tied the radiator etc assembly to the slam panel and removed the 6 bolts holding the support bracket to gain access to the drier plug. Which was a barsteward to remove- needing a T60 IIRC Jules

Post #444134 17th Aug 2024 10:10 pm
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scientician



Member Since: 01 Aug 2024
Location: Bangor
Posts: 6

Wales 

Congratulations on the fix, must be so nice having cold air and that annoying sound not being there.


Haven't had a chance to approach our garage to see if they could do a recharge with oil just in case that fixed it as some family stuff came up but now that it looks like this is a definite cure I will have to start to look at what it's going to take to get the compressor replaced round here. Might have to wait until next year though.

Post #444186 19th Aug 2024 10:38 am
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jules



Member Since: 13 Dec 2007
Location: The Wilds of Warwickshire
Posts: 4965

United Kingdom 2014 Freelander 2 SD4 SE Auto Firenze Red

I obtained the AC compressor from Autoairconparts; based in Brum.

Very speedy service.

https://www.autoairconparts.co.uk/compress...0232p.html


The mobile aircon service is a sister company AFAIK.
https://www.coolcaraircon.co.uk/ Jules

Post #444187 19th Aug 2024 11:37 am
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