This procedure covers removal and replacement of the front power window motor on a 1966 Chevrolet Corvette, requiring door panel removal and regulator access.

Warnings

Tools required

Parts

• Front power window motor × 1 — Use OEM specification or GM 4863639
• Door panel retaining clips (if broken) × 1 — Replacement plastic push clips

Preparation

1. Disconnect negative battery cable.
2. Roll window fully up if motor still functions, or manually push glass to full up position.
3. Protect door exterior with towel or fender cover to prevent scratches.
4. Have a helper available to support glass weight during motor removal if possible.

Procedure

1. 1

   Remove door panel screws
   Remove the Phillips head screws securing the door panel. There are 2 screws along the bottom edge of the door panel, 1 screw in the armrest area, and 1 screw behind the interior door handle trim. This door is equipped with power windows, so there is no manual window crank handle to remove. Proceed to removing the remaining door panel fasteners.
2. 2

   Remove door handle and trim
   Remove the interior door handle escutcheon by prying gently with a flat-head screwdriver or trim tool. The trim plate is held by a spring clip. Once exposed, remove the door handle mounting screws and carefully detach the handle linkage rod.
3. 3

   Detach door panel
   Using a door panel removal tool, carefully pry the door panel away from the door frame starting at the bottom corners. Work around the perimeter to release all push-in clips. Lift the panel up and away from the door once all clips are released. Set aside on a protected surface.
4. 4

   Remove moisture barrier
   Carefully peel back the plastic moisture barrier sheet far enough to access the window motor mounting area. Use masking tape to hold the barrier out of the way. Avoid tearing the barrier as it provides moisture protection.
5. 5

   Secure window glass
   With the window in the full up position, secure the glass using locking pliers clamped gently to the window track or use wooden blocks wedged between glass and door frame to prevent the window from dropping. Ensure glass is stable before proceeding.
6. 6

   Disconnect motor electrical connector
   Locate the power window motor electrical connector inside the door cavity. Disconnect the 2-wire connector by pulling apart the male and female terminals. Note and label the wire positions/colors for correct reinstallation, as polarity determines window up/down direction.
7. 7

   Disconnect motor from regulator
   Locate the window motor drive gear where it meshes with the regulator sector gear. Remove the bolts securing the motor to the regulator/mounting bracket (typically 3 bolts; verify count and socket size against the factory service manual). The motor may need to be rotated slightly to access all mounting bolts through the access holes.
8. 8

   Remove window motor
   Once all mounting bolts are removed, carefully disengage the motor drive gear from the regulator sector gear by tilting the motor. Maneuver the motor assembly out through the door access opening. This requires careful angling due to the limited access in C2 Corvette doors.
9. 9

   Transfer components to new motor
   If the new motor does not include a mounting bracket, transfer the bracket from the old motor. Remove the 3 bolts securing the bracket to the old motor housing (verify socket size against the factory service manual; matches the size used in Step 7) and install on the new motor in the same orientation. Ensure the drive gear is properly seated on the motor shaft.
10. 10

    Install new motor
    Maneuver the new motor assembly into the door cavity through the access opening. Align the motor drive gear with the regulator sector gear, ensuring proper mesh. Position the mounting bracket against the door inner panel and start all 3 mounting bolts by hand before tightening.
11. 11

    Secure motor mounting
    Tighten the 3 motor mounting bracket bolts (verify socket size against the factory service manual) to the manufacturer-specified torque. Tighten in a cross pattern to ensure even clamping. Verify the motor drive gear remains properly meshed with the regulator gear after tightening.
12. 12

    Reconnect electrical connector
    Reconnect the 2-wire electrical connector to the window motor. Ensure the connection is firm and terminals are fully seated. Route wiring to avoid interference with window regulator movement.
13. 13

    Test motor operation
    Temporarily reconnect the negative battery cable. Remove window glass supports and test window operation in both up and down directions using the window switch. Verify smooth operation without binding or unusual noise. Disconnect battery again before proceeding.

Reassembly

1. Reposition moisture barrier and press firmly to reseal against door panel mating surface.
2. Reinstall door panel by hooking the top edge first, then pressing firmly around perimeter to engage all push clips.
3. Reinstall interior door handle, escutcheon, and all mounting screws.
4. Reinstall window crank handle with retaining clip (if manual windows present on this door).
5. Reconnect negative battery cable.

Verification

• Test window operation through full travel in both directions multiple times.
• Verify window seats properly at full up position against weatherstrip.
• Check that window moves smoothly without hesitation or binding.
• Verify door panel is secure with no rattles or loose clips.
• Test all door functions including handle operation and lock mechanisms.

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