My '82 had a whistle in the driver's vent window area also and I traced it
down to a gap in between the seal and the primary drivers side window. You
can test this by pushing the roll-up window outward (which will seal it
against the outer seal race) while driving. If your whistle is caused by
such a gap then one way to fix it is to cut a sliver off of a credit card or
similar thin plastic and wedge it between the seal and the frame from the
inside which will tighten the seal at the gap.. Fixing that whistle was one
of the most satisfying repairs that I have made..
 Jonathan Poole