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Vent Window

Remove the door trim panel. See TRIM PANEL under REMOVAL & INSTALLATION.
Adjust the vent by placing a wrench on the adjusting nut, and then turning the vent window to the proper tension. See Fig 1 .
Install the trim panel. See TRIM PANEL under REMOVAL & INSTALLATION.

Fig 1: Adjusting Vent Window

Courtesy of GENERAL MOTORS CORP.