Download ’99 Buick Century Front Door Window Regulator Service Manual – REMOVAL PROCEDURE 1. Remove the trim panel. 2. Remove the water deflector. 3. Raise the window far enough in order to gain access through the door inner panel to the window to regulator bolts (2). 4. Remove the window to regulator bolts. 5. Raise the window to the full up position. 6. Tape the window in the full up position. 7. Disconnect the electrical connector. 8. Remove the regulator mounting bolts (1,2,3,4). 9. Remove the regulator from the door. INSTALLATION PROCEDURE 1. Install the regulator to the door. NOTE: Refer to Fastener Notice in Service Precautions. IMPORTANT: In order to ensure proper orientation of the window regulator to the door, tighten the window regulator bolts in the specified sequence (1,2,3,4). 2. Install the regulator mounting bolts. Tighten Tighten the window regulator bolts to 10 N.m (89 lb in). 3. Install the electrical connector. 4. Remove the tape. 5. Lower the window far enough in order to gain access through the door inner panel for the bolts. 6. Install the window to regulator bolts (2).