I bought a used 2004 GMC Sierra 1500 ex-cab 4x4 long bed w/ a 4.8 engine.
At 60-70 miles an hour the air squeels through the driver side door/window.
It appears to be coming in on the upper hinge side of the door. How do I
troubleshoot this issue? The door itself does not seem to be bent or warped ,
or tweaked.
tasher