Mitsubishi 3000GT Service Manual page 1012

produced here
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BODY
HOW TO LOCATE WIND NOISES
(1) Attach cloth tape to every place which might conceivably
be the source of wind noise, such as panel seams, projec-
tions, moulding seams, glass and body seams, etc.
(2) Then make a road test in order to determine that the
places not covered by tape are not sources of wind noise.
(3) Then remove the strips of tape one by one, making a
road test after each is removed, until a wind noise source
is discovered.
(4) When such a place is found, cover it again and continue
with the procedure so as to determine if there are any
other noise sources.
(5) If no others are found, the last remaining tape is the
only source.
(6) Cut the remaining piece of tape into smaller pieces, attach
it again as it was before, and then remove the pieces
one by one in the same way so as to narrow down the
source.
(7) Check to confirm that wind noise occurs when the last
remaining tape is removed, and that noise does not occur
when it is re-attached.
(8) When the source(s) of the wind noise is finally located,
attach butyl tape, body sealer or similar material to obstruct
this source as much as possible.
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