Here's a trick i used a few times and it works well. Roll down the
window. Then take a dollar bill and trap it between the door and the
jamb. With one hand thru the window, work the bill back and forth. You
should feel resistance as it slides back and forth. Work your way slowly
around the door opening sliding the bill from right to left. When you
get to a spot where theirs little resistance mark it. Then get a piece
of paer half the width of the bill and try it at that spot. If theirs no
resistance, that's probably where it's leaking. If that doesn't work
turn the radio up a little louder than normal.