2016-2020 Kia Sorento Back Glass: Defroster Faults and Shattering Risks

Known Issues: Spontaneous Shattering

While there are no official recalls for the back glass on the 2016-2020 Kia Sorento, a notable number of Kia owners have reported incidents of tempered glass, including sunroofs and rear windows, shattering spontaneously without any obvious impact. These events can sound like a loud pop or explosion and may occur while the vehicle is parked or being driven. Some reports suggest a link between using the rear defroster and the glass shattering, possibly due to thermal stress. Though less common than other failures, this is a known risk associated with the vehicle's tempered glass components.

Symptoms of a Failing Back Glass

Aside from obvious breakage, there are other signs that your Sorento's back glass or its integrated components may be failing.

Visible Cracks or Shattering

This is the most obvious symptom. Tempered glass is strong, but a direct impact from road debris or another object can cause it to shatter. Unlike a laminated windshield that cracks, the back glass will typically break into many small pieces, often held together temporarily by the window tint or defroster grid. If you see a small chip, it is unlikely to spread like a windshield crack, but it does represent a weak point in the glass.

Rear Defroster Not Working

If your rear window won't clear frost or fog when you press the defroster button, the system has failed. The problem could be electrical, such as a blown fuse or a bad relay, or it could be an issue with the glass itself. Scratches from loading cargo or cleaning can sever the delicate grid lines printed on the glass, creating an open circuit. A break in even one line can cause the entire system or a section of it to stop working.

Water Leaks

Water leaking into the rear cargo area from the top or sides of the liftgate is a sign of a failed seal. The back glass is held in place and sealed with a strong urethane adhesive. Over time, or due to improper installation, this seal can degrade and allow water to penetrate the cabin.

Buying a Used 2016-2020 Sorento Back Glass

A used OEM back glass can be a cost-effective, high-quality replacement. However, a thorough inspection is crucial to ensure you get a good part.

Step 1: Verify Compatibility

The primary OEM part number for this generation is 87110C5200, which supersedes the earlier number 87110C6000. Ensure the glass you are buying is from a 2016, 2017, 2018, 2019, or 2020 Kia Sorento. The glass should have a factory privacy tint and connections for the heated defroster.

Step 2: Physical Inspection Checklist

Before purchasing, carefully inspect the entire piece of glass:

• Defroster Grid Lines: Look closely at the horizontal lines on the inside of the glass. Run your finger gently over them. They should be smooth and unbroken. Any visible gaps, flakes, or deep scratches can mean the defroster will not work.
• Electrical Connectors: Check the tabs or connectors on the sides of the glass where the vehicle's wiring harness attaches. They should be firmly attached to the glass and free of corrosion or damage. A broken tab is very difficult to repair and usually means the defroster cannot be connected.
• Scratches and Pitting: Check for deep scratches or significant pitting on both sides of the glass. While minor cosmetic flaws are expected with a used part, deep gouges can compromise the integrity of the glass and obstruct vision.
• Delamination: Though rare on single-pane tempered glass, check the edges for any signs of separation or discoloration, which could indicate a manufacturing defect.
• DOT Markings: Confirm the glass has a DOT (Department of Transportation) stamp, which indicates it meets federal safety standards. An OEM part will always have this.

Why Choose Used OEM over New Aftermarket?

For a part like back glass, used OEM is often a better choice than a cheap aftermarket alternative. The original Kia glass guarantees a perfect match for the factory privacy tint, ensuring it doesn't look out of place with your other windows. Fitment is also guaranteed, which is critical for a proper, leak-free seal. Aftermarket glass can sometimes have slight variations in curvature or size, complicating installation.

Cost Comparison: Sorento Back Glass

Prices can vary based on supplier and location, but here is a general cost expectation:

Replacement Overview

Replacing a bonded back glass is a complex job that is best left to professionals.

• Difficulty: 4 out of 5
• DIY Feasibility: Not Recommended for Beginners
• Procedure: The process involves carefully removing the interior liftgate trim, disconnecting the defroster wires, cutting the old urethane seal with specialized tools, cleaning the frame meticulously, applying a new bead of urethane adhesive, and setting the new glass perfectly in place. Failure to do this correctly will almost certainly result in water leaks or wind noise.

Technical Service Bulletins (TSBs) & Recalls

As of mid-2024, there are no active recalls or TSBs specifically for shattering back glass on the 2016-2020 Kia Sorento.

However, there is a related notice for some 2019 Sorento models. Recall SC282 addresses an issue where water can enter the rearview camera, causing the display to go blank. While the camera is separate from the glass, a technician replacing the back glass should be aware of this and ensure the camera and its seals are handled correctly during the repair.

Frequently Asked Questions (FAQ)