[V8Vairs] Headliner

[Jim Acker]

Now that my V8 is on the road, I'm shaking out some bugs and have an
interesting one for you.  At highway speed, with the windows rolled down,
the first two sections of my headliner (between the front two bows) filled
up with air.  At first it was minor, but it eventually the bulge pushed down
to the top of my head and pulled the liner away from under the trim at the
top of the windshield.  Fortunately I hadn't glued this area.  I am not
using visors and I have a windshield mounted mirror.  Is this air behind the
headliner, or negative pressure caused by the windows being down? If its
behind the headliner, where is this air coming from and are there any steps
I can take prior to glueing the liner in place?
 
Jim Acker