Check that the door glass is securely set into the glass run groove.
Lower the door glass slightly [approximately 10 to 20 mm (0.39 to 0.79 in) ] and check that the clearance to the sash is parallel. If the clearance between the door glass and sash is not parallel, loosen the regulator bolts, guide rail bolts, and door glass and guide rail bolts to correct the glass position.