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2010 xc90 AC engine noise 165K Topic is solved

A mid-size luxury crossover SUV, the Volvo XC90 made its debut in 2002 at the Detroit Motor Show. Recognized for its safety, practicality, and comfort, the XC90 is a popular vehicle around the world. The XC90 proved to be very popular, and very good for Volvo's sales numbers, since its introduction in model year 2003 (North America). P2 platform.
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raquette
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2010 xc90 AC engine noise 165K

Post by raquette »

developed an engine noise. I was thinking this could be an idler bearing but sounds deeper inside the engine. replaced water pump serpentine and idler wheels and tensioner about 20k ago.




any ideas of what is causing this?
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matthew1
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Post by matthew1 »

Make the video public. It's set to private currently.
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raquette
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Post by raquette »

matthew1 wrote: ↑06 Aug 2024, 09:48 Make the video public. It's set to private currently.
I set it to public. thank you.
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Post by Krons »

May be easiest to find source of noise with a mechanic stethoscope.
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Post by MoVolvos »

raquette wrote: ↑06 Aug 2024, 09:42 developed an engine noise. I was thinking this could be an idler bearing but sounds deeper inside the engine. replaced water pump serpentine and idler wheels and tensioner about 20k ago.




any ideas of what is causing this?
.
Have you cycled the AC compressor to see if the noise changes?
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OR?
.

.
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Post by MoVolvos »

.

.
Blessings,

BKM


2008 C30 T5 2.0 M66
2007 S60 2.5T - New Project
2003 S80 T6 Transmission DIED
2000 S70 SE Base - New Project
1998 S70 T5 Prior
1989 240 Wagon Prior
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raquette
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Post by raquette »

I've narrowed it down to bad serpentine belt tensioner bearing or noise from the coupler that drives the alternator housing. used a stéthoscope to determine this.

as suggested will remove the serpentine belt to isolate the belt tensioner.
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Post by raquette »

removed the belt tensioner, started the engine with no load on the coupler drive except the alternator and the noise is now gone. the tensioner bearing is not terrible by the spin test.

I saw abscape suggested isolating the tensioner on another forum. Thank you!

napa has the tensioner, pulley and auxiliary idler part so will complete the repair tomorrow.
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Post by MoVolvos »

raquette wrote: ↑10 Aug 2024, 15:33 removed the belt tensioner, started the engine with no load on the coupler drive except the alternator and the noise is now gone. the tensioner bearing is not terrible by the spin test.

I saw abscape suggested isolating the tensioner on another forum. Thank you!

napa has the tensioner, pulley and auxiliary idler part so will complete the repair tomorrow.
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Please take a few photos as my 2012 XC90 is making a little noise in the area also. Haven't own it very long nor driven it much, besides a lack of familiarity with the 3.2 at this time, thanks.
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Post by raquette »

well replaced the tensioner and idler pulley, and the engine noise returned. the stéthoscope does not reveal noise from the water pump or power steering.

stumped at the moment...
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