Door Lock Actuator - Rear

Replacement of the rear door lock actuator on a 1966 Chevrolet Corvette, requiring removal of interior door panel and access through door cavity.

Warnings

Tools required

Parts

• Door lock actuator (rear) × 1 — Use OEM specification or aftermarket equivalent
• Door panel retaining clips × 1 — Replace any broken clips
• Interior door handle gasket × 1 — Replace if deteriorated

Preparation

1. Park vehicle on level surface and engage parking brake
2. Disconnect negative battery cable to prevent electrical shorts during actuator removal
3. Roll rear window fully up to prevent accidental damage during door panel removal
4. Prepare a clean work surface or blanket to place removed door panel
5. Test existing door lock function and note failure symptoms to verify proper repair

Procedure

1. 1

   Remove interior door panel screws
   Locate and remove the Phillips head screws securing the door panel. Remove the screw behind the interior door handle, the screw in the door pull/armrest area, and any screws along the bottom edge of the door panel. There are typically 3 screws total on the 1966 Corvette door panel.
2. 2

   Detach window crank handle
   Remove the window crank handle by locating the spring clip behind the handle. Use a clean cloth inserted between the handle and door panel, then work it around the handle base to catch and extract the horseshoe-shaped retaining clip. Pull the window crank handle straight off the regulator shaft. Keep the clip in a safe location for reassembly.
3. 3

   Remove interior door handle trim
   Carefully pry off the interior door handle escutcheon plate using a flat blade screwdriver wrapped in tape to prevent scratching. The trim piece is typically held by spring tension. Once removed, access the fastener securing the door handle mechanism and remove it to release the handle from the door.
4. 4

   Release door panel retaining clips
   Starting at the bottom rear corner, carefully pry the door panel away from the door frame using a panel removal tool or flat blade screwdriver. Work your way around the perimeter, releasing each metal spring clip from the door frame. The panel has approximately 8 clips around its perimeter. Lift the panel upward once all clips are released to disengage it from the upper door frame lip.
5. 5

   Remove moisture barrier access
   Peel back the plastic moisture barrier sheet to access the door cavity. Work carefully to avoid tearing the barrier. Only peel back enough to access the lock actuator location, typically near the door latch mechanism in the rear section of the door cavity.
6. 6

   Locate and disconnect door lock actuator
   Using a flashlight, locate the aftermarket door lock actuator mounted near the door latch assembly. Disconnect the electrical connector from the actuator by pressing the release tab and pulling straight off. Note the wire routing for reinstallation.
7. 7

   Disconnect actuator linkage
   Identify the actuator rod connecting the actuator arm to the door lock mechanism. Disconnect this linkage by removing the retaining clip with needle-nose pliers and sliding the rod off the ball joint or pivot point. Note the exact connection point and orientation for reassembly.
8. 8

   Remove actuator mounting fasteners
   Remove the mounting bolts or screws securing the actuator to the door frame, using the appropriate tool for the fastener type found on the installed aftermarket unit. Aftermarket actuator mounting hardware varies by kit; inspect the installed unit to determine the bolt count and head size before removal. Support the actuator while removing the final fastener to prevent it from falling into the door cavity.
9. 9

   Extract old actuator
   Carefully maneuver the old actuator out through the door panel opening. You may need to angle and rotate the actuator to clear internal door structures and the window regulator mechanism.
10. 10

    Install new actuator
    Position the new actuator in the same orientation as the old unit. Thread it through the door panel opening and align the mounting holes with the door frame brackets. Install the mounting fasteners finger-tight initially to allow for positioning adjustment.
11. 11

    Connect actuator linkage
    Reconnect the actuator rod to the door lock mechanism at the same connection point noted during disassembly. Secure with the retaining clip, ensuring it fully seats to prevent disconnection during operation. Verify the linkage moves freely without binding.
12. 12

    Tighten actuator mounting and test function
    Tighten the actuator mounting fasteners securely. Reconnect the electrical connector to the actuator. Temporarily reconnect the negative battery cable and test the lock actuator function using the aftermarket door lock switch. Verify smooth operation in both lock and unlock directions before proceeding. Disconnect battery again before continuing reassembly.

Reassembly

1. Reposition the moisture barrier against the door frame, ensuring complete coverage to prevent water intrusion into the door panel
2. Align the door panel with the upper door frame lip and lower into position
3. Press firmly around the perimeter to seat all retaining clips into their door frame holes
4. Reinstall the interior door handle mechanism and secure with fastener
5. Install the door handle escutcheon plate
6. Reinstall the window crank handle, ensuring the horseshoe clip fully engages the shaft groove
7. Install all door panel screws and tighten securely
8. Reconnect negative battery cable

Verification

• Test door lock function from both interior switch and key fob or remote (if equipped) multiple times to ensure reliable operation
• Verify door unlocks and locks smoothly without binding or excessive noise
• Confirm interior door handle operates properly and latch mechanism engages correctly
• Check that window crank operates without interference from door panel
• Inspect door panel fit and verify all fasteners and trim pieces are secure
• Test door opening and closing to ensure no rattles or loose components

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