A friend of mine in NC has a 2005 XC70 with around 95K miles. While the engine is cold, any accelleration produces a very high pitched whine that increases with speed. It does not do it if I let up on the throttle, only when giving it gas. In any gear.
As the engine warms up the whine decreases in intensity until after about 10 mintutes of driving. Then all is normal.
I check the tranny fluid, clean and full and recently changed.
As we were both on vacation, we did not get under the car in the Hotel parking lot. I told him to check the bevel gear, and flush it.
ANY comments or other possible solutions are welcome!
Thank you,
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