Do either of the door windows leak or rattle on your 90-96 300ZX, but the weatherstrips are either new or appear to be in good condition? If this applies to you, there may be a faulty window roller inside the door. 300ZX models have multiple rollers inside of the door that help guide the window as it moves up and down. They also keep the door windows in the correct position, which helps them make a seal with the weatherstrips. Window rattles and leaks are the result when the rollers go bad, but the top roller is the most prone to failure. This roller fits in the upper rear portion of the door glass. Sold individually; one required per door (two per car).
1990, 1991, 1992, 1993, 1994, 1995, 1996