2007-2011 Jaguar XK Back Glass: Defroster Faults and Replacement Costs
An in-depth guide to diagnosing rear defroster problems, inspecting a used back glass, and understanding replacement options for the XK Coupe.
- This back glass fits 2007-2011 Jaguar XK/XKR Coupe models ONLY; it does not fit convertibles.
- The most common failure besides breakage is a non-working defroster, usually caused by a broken electrical tab on the glass that is difficult to repair.
- Replacement is a professional-only job because the glass is a bonded structural component of the car.
- When buying a used part, the most important inspection is checking the integrity of the defroster grid terminals.
Key Compatibility Warning
Warning: This back glass is designed exclusively for 2-door Coupe models of the 2007-2011 Jaguar XK and XKR. It will NOT fit convertible models. The convertible top has its own unique, smaller glass window that is integrated into the fabric roof.
Symptoms of Failure
Failure of the XK's back glass typically falls into three categories: physical damage, heating grid malfunction, or seal failure.
1. Cracks and Shattering
Like any auto glass, the most common failure is physical damage from impacts (like road debris) or stress. As tempered glass, it is designed to shatter into many small, relatively harmless pieces upon a significant impact, which is a total failure requiring immediate replacement.
2. Rear Defroster Not Working
A very common issue specific to this vehicle is a non-functional rear defroster. You may press the defroster button, see the indicator light turn on, and even hear a relay click, but no heat is generated to clear frost or condensation from the glass. The most frequent cause is the electrical tab or connector where the vehicle's wiring attaches to the heating grid on the glass itself. This tab can break off or the connection can corrode, interrupting the flow of electricity. Less common causes include a blown fuse (Fuse F23, a 30A fuse located in the panel between the rear seats) or a faulty relay.
Pro Tip: In cold weather (generally below 41°F or 5°C), the rear defroster may turn on automatically when you start the car. This is a normal feature and not a sign of an electrical problem.
3. Water Leaks or Wind Noise
While less common, the urethane seal bonding the glass to the car body can fail over time, leading to water leaks into the trunk area or noticeable wind noise at highway speeds. Some owners also report the black rubber weatherstripping that frames the glass can oxidize, causing black streaks to run down the paint after a car wash. This is a cosmetic issue and does not necessarily mean the main structural seal is leaking.
Known Issues, TSBs, and Recalls
As of this writing, there are no official NHTSA recalls or Technical Service Bulletins (TSBs) specifically for the back glass on the 2007-2011 Jaguar XK Coupe. The most significant known issue, widely reported by owners in forums, is the failure of the rear defroster grid due to the electrical connector tab breaking off from the glass.
Buying a Used 2007-2011 XK Back Glass: A Buyer's Checklist
A used OEM back glass can offer significant savings over a new part. However, careful inspection is crucial, especially regarding the fragile defroster components. Use this checklist before you buy:
- Verify Fitment: Double-check that the glass came from a Coupe, not a Convertible. They are not interchangeable.
- Inspect the Defroster Terminals: This is the most critical step. Locate the two electrical terminals (tabs) on the glass where the defroster connects. Inspect them for any signs of damage, previous repairs (like conductive epoxy), or corrosion. If a tab is broken or missing, the defroster will not work, and repairs are often unreliable.
- Check the Heating Grid Lines: Carefully examine the orange or brown grid lines on the inside of the glass. Look for any scratches or breaks in the lines. A single broken line will create a horizontal strip that does not defrost.
- Examine for Scratches and Chips: Hold the glass up to a light source and inspect it from multiple angles. Pay close attention to deep scratches that could impair vision or minor chips near the edge that could develop into cracks later.
- Look for Delamination: Check the edges of the glass for any signs of a milky or hazy appearance, which could indicate the layers of glass are beginning to separate.
Cost Comparison: Jaguar XK Back Glass
Prices can vary significantly based on the source of the part and local labor rates.
| Part Type | Estimated Cost | Notes |
|---|---|---|
| New OEM | $1,200 - $1,450 | Purchased from a Jaguar dealership. Guarantees perfect fit and function. |
| New Aftermarket | $250 - $350 | Made by third-party manufacturers. Quality can vary, but a cost-effective option. |
| Used OEM | $200 - $400 + Shipping | Salvaged from a donor vehicle. Offers OEM quality at a lower price, but shipping for large glass can be very expensive ($300+). Requires careful inspection. |
| Shop Labor | $250 - $450 | Cost for a professional auto glass technician to remove the old glass and install the new one. |
Replacement and Installation
Professional Installation Required: Replacing the back glass on an XK is not a DIY project. The glass is a structural element of the car, held in place by a strong urethane adhesive. Special tools are required to safely cut out the old glass without damaging the paint or bodywork. Proper preparation of the frame and new glass, along with the correct application of urethane, is critical for preventing leaks and ensuring the vehicle's structural integrity.
Installation Difficulty: 5 out of 5 (Professional Only)
Estimated Time: 2-3 hours
OEM Part Numbers and Specifications
These part numbers are known to fit the 2007-2011 Jaguar XK Coupe. Always confirm fitment with the seller using your vehicle's VIN.
- 6W8342006AD
- 6W8342006AE
- C2P16012 (replaces C2P5104)
- C2P5104
Aftermarket cross-reference numbers include FB23100GT and FB23100GTY.
Frequently Asked Questions (FAQ)
Is the back glass the same for the XK and XKR?
Yes, for the Coupe models within the 2007-2011 year range, the back glass is the same for both the standard XK and the supercharged XKR.
Can I repair the broken defroster tab on my old glass?
While there are special conductive epoxy kits designed for this purpose, they often fail. The connection point is subject to vibration and temperature changes, and achieving a durable, long-lasting bond that can carry the required electrical current is very difficult. Replacement of the glass is the only guaranteed solution.
How can I test the defroster grid on a used back glass before installing it?
You can use a multimeter set to measure resistance (Ohms). Place one probe on each of the two electrical terminals. A healthy grid should show a low resistance reading (typically between 1-10 Ohms). If the meter reads infinite resistance or 'OL', it means there is a break in the circuit and the grid will not work.
Can a crack in the back glass be repaired?
No. Unlike laminated windshields which can sometimes have small chips repaired, the back glass is made of tempered glass. Any significant damage will cause it to shatter into small pieces, so repair is not an option. The entire glass must be replaced.
Technical Specifications
OEM Part Numbers: 6W8342006AD 6W8342006AE C2P16012 C2P5104
Fits 2-door Coupe only. Features a built-in heated defrosting grid.
The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
- Jaguar XK:
- Key Compatibility Warning
- Symptoms of Failure
- 1. Cracks and Shattering
- 2. Rear Defroster Not Working
- 3. Water Leaks or Wind Noise
- Known Issues, TSBs, and Recalls
- Buying a Used 2007-2011 XK Back Glass: A Buyer's Checklist
- Cost Comparison: Jaguar XK Back Glass
- Replacement and Installation
- OEM Part Numbers and Specifications
- Frequently Asked Questions (FAQ)
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