2018-2021 Lincoln Navigator Cargo & Quarter Panel Trim Guide

Identifying the Correct Interior Trim Panel

The part numbers JL1Z-78424B36-AD and KL1Z-78424B36-AD refer to the large interior trim panels in the rear cargo and third-row area of the 2018-2021 Lincoln Navigator. These are often called quarter panel trim or loadspace trim panels. Part numbers can vary based on the vehicle's wheelbase (standard vs. L), color, and specific options like the Revel audio system, which includes a speaker grille on the passenger side panel. It is crucial to match the part to your vehicle's specific configuration.

Symptoms of a Damaged or Failing Side Panel

Failure of an interior trim panel is typically cosmetic or results in annoying noises rather than mechanical problems. Here are the most common symptoms:

• Rattling or Buzzing Noises: This is the most frequent complaint from owners. The large plastic panel can vibrate against the metal body or other components, especially when driving on rough roads or when the stereo system's bass is turned up. The noise often comes from loose or broken mounting clips.
• Visible Damage: Scuffs, deep scratches, and cracks are common, especially in the cargo area from loading and unloading items. Panels can also be damaged during removal for other repairs if not done carefully.
• Poor Fitment: Gaps between the panel and the headliner, door seals, or other trim pieces indicate broken or missing clips, or that the panel has been improperly installed.
• Broken Components: The panel may house speaker grilles, cargo hooks, or 12V power outlets. Damage to the panel can cause these components to become loose or inoperative.

Known Issues, Recalls, and Technical Service Bulletins (TSBs)

While there are no specific recalls for the main cargo side panels themselves, there are related items and common complaints to be aware of:

• TSB 21-2419: Some 2018-2021 Navigators may have an issue where the gap hiders for the load floor compartment become detached from the bin. This is a separate but adjacent part to the main side panels.
• Common Rattle Complaints: Owners on forums frequently discuss rattles originating from the rear cargo area, often related to the subwoofer panel or other trim pieces. These are typically resolved by adding foam insulation or securing loose clips.

As of mid-2024, no major safety recalls directly involve the composition or mounting of these specific interior side panels. Always check for open recalls on your specific vehicle using its VIN on the NHTSA website.

Buying a Used 2018-2021 Navigator Interior Side Panel

For a part like this, a used OEM panel is often the best and only choice, as aftermarket manufacturers rarely produce large, color-matched interior trim pieces.

How to Verify Color and Trim Match

This is the most critical step. Interior colors are not identified by the exterior paint code. You must find the Interior Trim (INT TR) code on the Safety Compliance Certification Label, which is located on the driver's side door jamb.

The label will have a field marked "INT TR". The second character of this two-part code indicates the color. Common interior colors for the 2018-2021 Navigator include:

• W - Black Onyx
• F - Cashmere
• 2 - Black Onyx/Russet
• N - Sandstone

Always confirm the trim code from your vehicle's sticker before purchasing a used panel to ensure a perfect match in color and material texture.

Physical Inspection Checklist

When inspecting a used panel, pay close attention to the following:

• All Mounting Tabs and Clips: Carefully inspect the back of the panel. Look for any plastic tabs that are cracked, stressed (showing white lines), or broken off completely. These are the most common points of failure and are essential for a rattle-free installation.
• Surface Condition: Check for deep gouges, scratches, or discoloration from sun exposure. Minor scuffs in the cargo area are common and may be acceptable, but deep damage cannot be easily repaired.
• Material Integrity: On higher trim levels (like Reserve and Black Label), these panels may have soft-touch surfaces or leather inserts. Ensure there is no peeling, delamination, or staining.
• No Previous Repairs: Look for signs of glue, epoxy, or plastic filler on the back of the panel, which indicate a previous, likely improper, repair.
• Component Housings: If the panel includes a speaker grille or power outlet, ensure the mounting points for these components are intact and not cracked.

Replacement Overview

Replacing the rear quarter trim panel is a feasible DIY project for someone with patience and the right tools. The process generally involves removing several other smaller trim pieces first, such as the floor scuff plate and D-pillar trim.

Tools Required:

• Plastic Trim Removal Tool Kit (essential to avoid scratching panels)
• Socket set (for any bolts holding seats or other components)
• Pliers or clip puller

The panel is held in place by a series of hidden metal spring clips and plastic alignment tabs. The key is to use a trim removal tool to gently pry the panel away from the body, releasing one clip at a time. You may also need to disconnect electrical connectors for lights or power outlets.

Cost Comparison

Frequently Asked Questions (FAQ)