GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 1999 🢒 Astro - 2WD 🢒 Body and Accessories 🢒 Seats 🢒 Power Seat Adjuster Does Not Move Vertically

One Seat Adjuster will not Operate Vertically

Problem

Action

The vertical drive cable is disconnected or damaged,
  1. Inspect the vertical drive cables.
  2. Replace the cables, if needed.

The vertical gearnut is inoperative.

Replace the vertical actuator assembly.