GM Service Manual Online
For 1990-2009 cars only

Causes of Slow Moving Glass

    Caution: Disconnect the power window switch when working inside the driver door. When operated, the Express Up/Down Feature allows the door window to move very quickly, without stopping, which could cause personal injury.

  1. Listed below are four conditions that may cause a window to operate slowly:
  2. • The window run channel outboard lip at the rearview mirror is rolled over or the glass run channel outboard lip at the center pillar is rolled over.
    • The window run channel is not seated at the center pillar.
    • The window is misaligned in the opening.
    • The regulator is misaligned causing misalignment of the window.
  3. Use the following adjustment procedures in order to correct the condition causing a window to operate slowly.

Adjustment Procedure

  1. Remove the door trim panel. Refer to Front Side Door Trim Panel Replacement or Rear Side Door Trim Panel Replacement .
  2. Remove the water deflector. Refer to Front Side Door Water Deflector Replacement or Rear Side Door Water Deflector Replacement .

  3. Object Number: 443897  Size: SH
  4. Condition 1.1: Using a flat-bladed tool, straighten the run channel lip (2) by pulling the lip out to its correct position.
  5. Condition 1.2: Using a flat-bladed tool push the run channel rearward seating the channel in the door frame.

  6. Object Number: 443902  Size: SH
  7. Condition 1.3: Loosen the window-to-window regulator bolts.
  8. Rotate the cam (5) on the window regulator plate so that the slot (6) is straight up and down. In this position, the back of the window will tilt forward.

    Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

  9. Tighten the window to regulator bolts.
  10. Tighten
    Tighten the bolts to 10 N·m (89 lb in).

  11. Condition 1.4: Loosen the window-to-regulator bolts (1, 2).
  12. Loosen the four window regulator to door bolts.
  13. Align the window regulator.

  14. Object Number: 164576  Size: SH
  15. Tighten the bolts which secure the window regulator to the door according to the tightening sequence: 1, 2, 3, 4.
  16. Tighten
    Tighten the bolts to 10 N·m (89 lb in).


    Object Number: 164570  Size: SH
  17. Tighten the regulator motor to door bolts (1, 2) which secure the window-to-window regulator to the window.
  18. Tighten
    Tighten the bolts to 10 N·m (89 lb in).

  19. Connect the power window switch.
  20. Test the power window for proper operation.
  21. Install the door water deflector. Refer to Front Side Door Water Deflector Replacement or Rear Side Door Water Deflector Replacement .
  22. Install the door trim panel. Refer to Front Side Door Trim Panel Replacement or Rear Side Door Trim Panel Replacement .