I'd ask the dealer to check technical service bulletins. There
is one issued for 98s on this (TSB 8840024). You can also get some
weird noise with a strong cross wind (but I've only heard this
twice in 5 years and for short periods of time).
Here is the TSB content with serial numbers (but, I must
say I find it confusing and I'm not sure if you can determine if
your car is included from this):
Noise may be heard on cars with an integrated upper windshield molding. The noise can be reduced if a weatherstrip is installed between the windshield molding and the car body. The weatherstrip will be included with new windshield. A self-adhesive molding has introduced into production from chassis number end points listed below. The weatherstrip can be used on cars within the following chassis numbers and on older cars which have had windows replaced for new versions.
Model Factory Chassis No.
S70 1 599542-628460
S70 2 598673-628460
V70 2 590194-643356
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