If you have a place where you can drive along a wall, maybe a building at the back or side of a strip mall or something similar, open the windows on the passenger side and then drive with that side towards the wall. The whining will echo off the wall and be louder if it is coming from that side of the car. Turn around and do the same for the driver's side, with the windows on that side open. If the noise is coming from one side or the other, you should be able to tell from the echo.

You can also set up an inexpensive mechanics stethoscope (I just saw that Harbor Freight is selling them for $2.49) with a long length of tubing and tape the tubing to the fender, pointing right at the hub on each wheel, successively, and you should be able to identify where it is coming from.

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