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2001 S60 2.4T - Noise from alternator

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lukpers
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2001 S60 2.4T - Noise from alternator

Post by lukpers » Tue May 12, 2020 2:17 am

Hello,

I have a huge problem with my alternator in Volvo s60 2.4t 2001r, namely, its a source of annoying noise (mid/high freq. like a vacuum cleaner), it can be only heard from inside car with all doors closed and it changing due at rpm. When I detach plus cable from alternator a noise disappear. I have checked almost everything, two different alternators have been replaced, battery, mass connections,belt, tensioner, etc. I don't know what can I do else, three car mechanics couldn't find a reason. Maybe you could give me some advise regarding it.
Thanks in advance.

Regards
Lucas

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oragex
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Re: 2001 S60 2.4T - Noise from alternator

Post by oragex » Tue May 12, 2020 7:44 am

Welcome
Why do you think it's from the alternator if you can't hear it from near the engine ? Try very carefully with a hose www.youtube.com/watch?v=qVWY2fMzrpc

When you undo the alternator cable, the car is running on battery only on lower voltage, perhaps it makes a faulty module work better. What is the voltage with the engine running ?

If you find out it's the alternator regulator making the noise, try looking at the fuse boxes, the rear one inside the trunk, and the one inside the engine bay - this one sometimes gets some contacts damaged under the fuses, not too difficult to replace

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RickHaleParker
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Re: 2001 S60 2.4T - Noise from alternator

Post by RickHaleParker » Tue May 12, 2020 8:19 pm

Use a Ear Trumpet to localize the source of the noise.
--------
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Re: 2001 S60 2.4T - Noise from alternator

Post by darrylrobert » Tue May 12, 2020 9:43 pm

could the noise be coming from the power steering pump?
1981 260 GLE converted to 240 M46 after auto box failure
1987 740t auto converted to M47
1997 V70t5 auto converted to M56
1998 V70 factory M56 (parts car)
2001 XC70 factory M58
2002 XC70 auto (parts car)

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Re: 2001 S60 2.4T - Noise from alternator

Post by lukpers » Wed May 13, 2020 2:39 am

Hello everyone,

Thanks for reply! I really appreciate,
So, I've taken your suggestions especially Oragex, voltage on running engine is ~14,4V, I used stethoscope and checked the noises
coming from engine, and alternator seems to be ok!, steering pump as well so I closed the door and I started searching noises inside a car, under steering wheel I noticed increasing that noises from there and I quite sure that the source of this noise is one element (attachment below). I not able to detach plus cable from alternator today to confirmed it. Do you know what it is?
Attachments
Screenshot_2.jpg
Screenshot_2.jpg (85.63 KiB) Viewed 93 times

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Re: 2001 S60 2.4T - Noise from alternator

Post by oragex » Wed May 13, 2020 6:16 am

That looks close to the location of the CEM module, and your 2004 was the first year with water ingress on the CEM.

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Re: 2001 S60 2.4T - Noise from alternator

Post by lukpers » Wed May 13, 2020 10:57 am

Hello again,

Problem is solved!
I removed this element and it turned out it is kind of speaker/buzzer, probably it is a part of alarm system but it is not original volvo
part. Right now is a silent in the car! Thank you very much for your help and your time.
Best Regards
Lucas
Attachments
IMG_20200513_165655.jpg
IMG_20200513_165655.jpg (172.1 KiB) Viewed 70 times

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Re: 2001 S60 2.4T - Noise from alternator

Post by oragex » Wed May 13, 2020 12:02 pm

Definitely not original part, good fix

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