significant wind noise approaching higher speeds--appears to be coming from the windshield area. is a prob on our 98 as well.
wind noise on 1999 Volvo S70
Can also put someone on the inside while spraying with water on outside and see if can see water come thru. I recently found my source of wind noise in my truck by driving and pushing out slightly at the top of w/s and friend did it when became unsafe while driving and hearing air noise pitch change. Sometimes the sealer on w/s breaks down over time like mine did.