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sprinkles08
sprinkles08, ASE Certified Technician
Category: Volvo
Satisfied Customers: 23130
Experience:  ASE Master and Advanced level certified. Factory trained with 17 years dealership experience
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Recently purchased 2004 Volvo XC90 2.5T AWD, 220000km, have

Customer Question

Recently purchased 2004 Volvo XC90 2.5T AWD, 220000km, have no service records but appears well-maintained, and I do know the timing belt was done at 214,000 km. MaxiDiag 802 shows hydraulic pressure fault and faulty pump in differential, there does appear
to be a small fluid leak on the differential. Two questions: When releasing the cruise control at highway speed, there is a way-wah-wah kind of whine sound like the sound of an industrial saw powering down gradually. Is that normal turbo whine or could it
be a differential low on oil? (Never hear the sound otherwise.) If the differential needs topping up, how do I know when it's full? Also, today temperatures dropped just below freezing and there was a significant change in the auto transmission, the 1-2 upshift
had a noticeable (like a good 1-second) lag, and the 2-3 did somewhat as well. Is that transmission trouble or just means its due for a flush and refill? There's no dealership around for 200 miles, so can I do it myself, and with what fluids?
Submitted: 1 year ago.
Category: Volvo
Expert:  sprinkles08 replied 1 year ago.

Hello and welcome to JustAnswer!

The noise you're hearing could be gear noise. Improper contact between the ring and pinion gears in the differential will cause a whining type noise that is throttle sensitive. Pinion bearings can cause a throttle sensitive noise also but it should be more of a growl. It's possible that the leak has allowed the fluid to run low enough to cause damage. Low fluid in itself won't cause a noise but will cause accelerated wear to components in turn causing noise.

You mentioned it happening when canceling cruise, is that the only time the noise is produced?

Customer: replied 1 year ago.
The only time I've heard it is when cancelling cruise at highway speed, but I suppose it would do the same if took my foot off the gas.
Expert:  sprinkles08 replied 1 year ago.

If you accelerate to the same speed where the problem happens and then coast do you hear the noise?

Customer: replied 1 year ago.
Not sure I'll have to try that
Customer: replied 1 year ago.
Might not happen now anyway it's gone really cold up here last day or so
Expert:  sprinkles08 replied 1 year ago.

Let me know what you find!

Customer: replied 1 year ago.
ok
Expert:  sprinkles08 replied 1 year ago.

Thanks.