2007-2017 Jeep Compass Back Glass: Defroster Failures and 'Classic' Model Guide
This guide covers common rear defroster problems, how to verify you have the correct glass for the 2017 'Classic' model, and what to inspect on a used part.
- For 2017 models, you MUST confirm you have the 'Classic' (MK body) with vertical rear door handles, as the new generation (MP body) glass is different.
- The back glass from a 2007-2017 Jeep Patriot is a direct fit for the 2007-2017 Compass MK.
- When buying a used part, the most critical inspection points are the defroster grid lines and the soldered electrical tabs; damage to either is difficult to repair.
- Replacement is not a DIY-friendly job; professional installation is strongly recommended to prevent water leaks and ensure safety.
Critical: The 2017 'Classic' Model Year Distinction
The most important factor when sourcing a back glass for a 2017 Jeep Compass is identifying the correct body style. In 2017, Jeep sold two different versions of the Compass simultaneously:
- 2017 Jeep Compass 'Classic' (MK Body): This is the first-generation body style that began in 2007. It is identifiable by its vertical, pillar-mounted rear door handles. The back glass from any 2007-2016 Compass will fit this model.
- 2017 Jeep Compass (MP Body): This is the completely redesigned, second-generation model. It has conventional, door-mounted rear door handles. The back glass for this model is different and not interchangeable with the 'Classic'.
Warning: Before purchasing, you must verify which 2017 model you have. Ordering a part for a '2017 Compass' without specifying 'Classic' will likely result in receiving the wrong glass for the older body style.
Symptoms of Failure
Obvious Breakage or Shattering
The most common reason for replacement is physical damage from an impact, such as from road debris, a collision, or vandalism. Tempered back glass can also shatter spontaneously without any apparent impact. This can be caused by thermal stress (rapid temperature changes) or tiny, invisible flaws in the glass from the manufacturing process. When it fails, it will break into thousands of small, cube-like pieces.
Rear Defroster Not Working
A very common issue is a partial or complete failure of the rear defroster. This is often caused by damage to the delicate heating grid lines on the inside of the glass. A single scratch or break in one of the lines can cause the entire system or a section of it to stop working. Other causes can include a blown fuse, a bad relay, 🎬 Watch this guide to check and replace the rear defroster fuse. or the electrical connector tabs on the glass becoming detached.
Water Leaks
If the urethane seal that bonds the glass to the liftgate fails, water can leak into the cargo area. This is usually a result of improper installation, but the seal can also degrade over time. While a TSB for back glass water leaks exists for other Jeep models, none were found specifically for the 2007-2017 Compass.
Known Issues, Recalls, and TSBs
No major safety recalls have been issued by the National Highway Traffic Safety Administration (NHTSA) for the back glass on the 2007-2017 Jeep Compass.
However, a non-compliance issue was reported for some replacement glass manufactured for 2013-2017 models. The glass was incorrectly marked with an "AS2" logo instead of the correct "AS3" designation. NHTSA ultimately deemed this noncompliance inconsequential to motor vehicle safety, as the glass itself met all required safety standards. This is a labeling issue only and does not affect the performance or safety of the part.
Buying a Used Back Glass: What to Inspect
A used OEM back glass is an excellent, cost-effective alternative to a new part, as the glass itself does not wear out. However, careful inspection is crucial.
- Inspect the Defroster Grid: This is the most critical check. Carefully examine every horizontal line of the heating grid from multiple angles. Look for any scratches, nicks, or breaks. A single damaged line can render the defroster useless.
- Check the Electrical Tabs: Locate the two metal tabs where the vehicle's wiring harness connects to the defroster grid. These are typically soldered onto the glass at the sides. Ensure they are firmly attached and not damaged. These tabs can easily be broken off when the glass is removed from the donor vehicle, and they are very difficult to reattach reliably.
- Verify Tint and Features: The standard OEM back glass for the Compass comes with factory privacy tint and is heated (defrost). Ensure the part you are buying matches these specifications.
- Look for Scratches: Check the glass for any deep scratches that could impair vision. Minor surface scuffs are usually acceptable, but deep gouges are a reason to pass.
- Confirm Interchangeability: The back glass for the 2007-2017 Jeep Compass (MK) is also a direct fit for the 2007-2017 Jeep Patriot. This widens the pool of potential donor vehicles when searching for a used part.
Cost Comparison
Prices for a replacement back glass can vary significantly based on the source and type of part. Labor costs for professional installation are an additional factor.
| Part Type | Estimated Cost |
|---|---|
| New OEM (Mopar) | $610 - $725 |
| New Aftermarket | $200 - $400 |
| Used OEM | $100 - $250 |
| Shop Labor | $150 - $300 |
Replacement Difficulty
Replacing a bonded back glass is a complex job that is not recommended for beginners. It requires specialized tools and knowledge to avoid causing leaks or damaging the vehicle.
- Difficulty Rating: 4 out of 5
- Primary Risks: Improperly cutting out the old glass can scratch the vehicle's paint, leading to rust. Failing to properly clean and prime the frame will result in a weak bond, causing water leaks and wind noise. Applying the urethane bead incorrectly can also lead to immediate leaks.
- Specialty Tools: A cold knife or wire-out tool to cut the old adhesive, urethane primers for both the glass and the body, and a professional-grade urethane adhesive gun are required.
Pro Tip: Due to the risk of leaks and the need for specialized tools, this job is best left to a professional auto glass technician. The labor cost is a worthwhile investment to ensure a safe and weatherproof installation.
Frequently Asked Questions
Is the back glass for a Jeep Compass the same as a Jeep Patriot?
Yes, the back glass is interchangeable between the 2007-2017 Jeep Compass (MK 'Classic' body) and the 2007-2017 Jeep Patriot. They are built on the same platform and share many body components.
Can I repair a broken line on my rear defroster grid?
Yes, it is possible to repair minor breaks in a defroster grid line. Auto parts stores sell special repair kits that contain a conductive paint or epoxy. You carefully mask off the area around the break and apply the conductive material to bridge the gap, restoring the electrical circuit.
Why did my back window shatter for no reason?
This is known as spontaneous breakage and is a documented issue with tempered glass in many vehicles. It can be caused by internal stress from the manufacturing process, or by a rapid and extreme change in temperature (thermal shock). A very small, almost invisible chip or flaw along the edge of the glass can also concentrate stress over time, eventually leading to a sudden failure.
What does the 'MK' body style mean for a 2017 Compass?
The 'MK' is Jeep's internal designation for the first-generation Compass platform (2007-2017). In 2017, Jeep began selling the all-new 'MP' generation but continued to sell the older MK version for a short time, branding it as the 'Compass Classic'. The parts are not interchangeable between the two generations.
Helpful Videos
Technical Specifications
OEM Part Numbers: 5074912AC 5074912AD 5074912AE 5074912AF 5074912AG 5074912AH 5074912AI 05074913AG 5074913AC 5074913AD 5074913AE 5074913AF
Solar controlled, factory privacy tint, heated (defrost), includes hole for rear wiper.
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.
- Jeep Compass:
- 🎬 Helpful Videos
- Critical: The 2017 'Classic' Model Year Distinction
- Symptoms of Failure
- Obvious Breakage or Shattering
- Rear Defroster Not Working
- Water Leaks
- Known Issues, Recalls, and TSBs
- Buying a Used Back Glass: What to Inspect
- Cost Comparison
- Replacement Difficulty
- Frequently Asked Questions
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