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HOMESERVICE MANUALSGMC1989MAGNAVAN 5.7 K, 3L80/M40REPAIR AND DIAGNOSIS (SINGLE PAGE)BODY & FRAMEPOWER WINDOWSREMOVAL & INSTALLATIONWINDOW REGULATOR & MOTORREMOVAL (EXCEPT "S" SERIES)
1989 GMC Magnavan 5.7 K, 3L80/M40

Removal (Except "S" Series)

1989 GMC Magnavan 5.7 K, 3L80/M40SECTION Removal (Except "S" Series)
  1. Raise window to full "UP" position and tape glass to door frame to prevent it from falling. Disconnect battery negative cable. Remove armrest, trim panel, armrest bracket, and water deflector.
  2. Disconnect harness from power window motor. Using a 3/16" drill bit, drill out motor attaching rivets and remove motor. Push regulator forward and then slide it rearward to remove regulator arms from sash and rail. See Figure .
  3. Fold regulator arms and remove through access hole in door. Drill a hole through sector gear and backplate. Do not drill closer than 1/2" to edge of sector gear or backplate.
  4. Install a 3/4" long sheet metal screw into hole to lock sector gear. Sector gear must be locked to avoid personal injury. Remove motor-to-regulator rivets and remove motor.
RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.