Cracked Porsche Boxster Rear Plastic Window – Repair Options

A Critical Issue on Porsche Boxster 986 cars, made before 2003, is dealing with a Cracked Porsche Boxster Rear Plastic Window

Porsche produced the original Boxster with a plastic rear window. The lifespan of the plastic window can be quite low. You need to be careful of both “cold crack” and scratching problems.

In 2003 Porsche upgraded the Boxster to a glass rear screen, however, they changed the pattern at the same time making it impossible to upgrade the old cars with the new convertible top. The new OEM convertible top with a rear glass window, can not be retrofitted onto pre-2003 Boxsters.

Boxster 986 Rear Window, replacing a Cracked Porsche Boxster Rear Plastic Window
Boxster 986 Rear Window, replacing a Cracked Porsche Boxster Rear Plastic Window

Care for Your Rear Plastic Window

If you own a Porsche Boxster 986 with a rear plastic window, you need to be extra careful. Here are some tips for increasing the lifespan of your rear plastic window.

Boxstertips - PCA Pedro Bonilla
Boxstertips – PCA Pedro Bonilla

Pedro has had his 1998 Boxster rear plastic window last well over 20 years.

1.0 Do Not Lower the 986 Convertible Top in Cold Weather

Be very careful when opening your convertible top in cold weather. The colder the weather the more prone your plastic rear window is apt to crack. Never operate the convertible top under 55ºF (or 12°C) without a thorough warm-up.

Newer plastic rear windows are very pliable but age sees the rear plastic windows get brittle and inflexible.

Never use your convertible top below 40°F or 5°C!

2.0 Boxster Chop

All owners of a 986 with a rear plastic window need to learn the “Boxster Chop”. You need to get your black belt in this critical defensive maneuver.

When you do lower the top, open the top enough to start the rear window folding then get out of the car and do a ‘chop’ with your arm/hand and make a nice even crease/fold in the window so when you open the top all the way the window doesn’t develop a compound fold/crease.

The “Boxster Chop” is recommended in all weather conditions as a defensive measure.

What is the Boxster Chop?!?

3.0 Yearly Maintenance of Rear Place Window

If you have a rear plastic window on your Porsche Boxster you need to take extra special care of it. You need to clean and polish it yearly to prevent oxidation (or yellowing and pitting.)

3.1 Clean and Protection of the Rear Plastic Window

The plastic rear window will fog and scratch which is one of the biggest complaints from Boxster owners. Fogging and oxidation happen as the plasticizers evaporate. This is caused by UV Light and the heat from the sun. As a result, the Boxster’s Rear Plastic Window becomes cracked or damaged.

The best way to maintain your plastic rear window is to keep the sun off the plastic rear window as much as possible. Use a good plastic cleaner and UV protectant.

3.2 Polish Your Rear Plastic Window

Rid your read plastic window of minor scuffs, yellowing, and scratches using good plastic polish. Your rear plastic window can be restored using a plastic polishing compound.

Repair Options for your Porsche Boxster Rear Cracked Plastic Window

1.0 Seal the Crack ASAP on Your Plastic Window

Once you notice that your rear plastic window is cracked, you need to act immediately to prevent further damage. Minimize all use of your convertible top until you choose an option to repair the issue.

1.1 Quick Fix for Cracked Rear Window

It is important to seal your cracked window ASAP. You do not want the crack to spread or cause more damage. Lamin-X has a dedicated Convertible Plastic Window Repair solution. Very durable and will stand up to time. It comes with a 5-year warranty.

Lamin-x Convertible Top Clear Window Repair Universal
  • Clear 2" x 24" Universal Adhesive Film
  • Glossy finish for high-quality look
  • Made in USA, 5-year warranty, industry-leading product
  • Transparent film that adheres directly onto your soft window

2.0 Replace the Rear Plastic Window

Many forum Porsche Boxster members have reported excellent service for the rear plastic window from Boat Canvas Repair service shops. All boats make use of canvas covers with plastic windows. Many drivers have received cost-efficient solutions for a quick repair or replacement of the plastic window.

Boat Repair can replace the plastic window at a reasonable price.

3.0 Repair Worn, Torn, or Damaged Convertible Canvas

This is a preferred option if you get your canvas cut because of theft (or break and enter of your car.) These shops can do a quick waterproof seal to your canvas roof.

Canvas Repair of Convertible Top

It is critical that you need to get this on quickly to prevent the holes or tears from spreading. Your fastest and best solution would be to use a canvas patch. We recommend that you use a Gore-Tex canvas patch. You need a 1/2 inch over coverage on the patch and you can cut to size to minimize the size of the patch.

Make sure you get a quote and compare any previous work of the shop.

4.0 Replace the Rear Plastic Window with Glass

For this option, you will need to investigate using a car service repair shop that specializes in convertible tops. I have to warn you though, that the cost for this repair will almost always exceed the cost of the next and preferred option of replacing the entire top..

When getting this quote, also ask for a complete replacement of the top as well. This will give you a good comparison. Please note that the replacement of the rear window will still be the same size and not larger as seen in the post 2003 Boxsters.

5.0 Replacing Your Porsche Boxster Convertible Top

Many 986 owners opt to get a new canvas top, complete with a new glass window. If you’re looking to buy an early Boxster 986, please keep in mind this upgrade and the costs involved.

compatible with Porsche Boxster Convertible Top With Plastic Window Black Canvas Cloth(1997-2002)
  • 1 Year Manufacturer Warranty
  • Canvas Cloth
  • Window: 50 Gauge Heavey Plastic window like the original
  • This top comes completely assembled and ready to install. No sewing is required
Sale
compatible with Porsche Boxster 986 1997-2002 Convertible Top With Heated Glass Window Canvas Cloth (Black)
  • Canvas Cloth
  • DOT Approved Heated Glass Window.
  • This top comes completely assembled and ready to install. No sewing is required.
  • Our tops are Brand new in the original box.
SaleBestseller No. 1
compatible with Porsche Boxster 986 1997-2002 Convertible Top With Heated Glass Window Canvas Cloth (Black)
  • Canvas Cloth
  • DOT Approved Heated Glass Window.
  • This top comes completely assembled and ready to install. No sewing is required.
  • Our tops are Brand new in the original box.
Bestseller No. 2
Sierra Auto Tops Convertible Top Replacement for Porsche Boxster 1997-2002, German Acoustic A5 Canvas, Black
17 Reviews
Sierra Auto Tops Convertible Top Replacement for Porsche Boxster 1997-2002, German Acoustic A5 Canvas, Black
  • Upgraded German A5B/DS Acoustic Cloth / Canvas for superior sound dampening
  • Entire top is cut from the same bolt of cloth for consistent color and pattern
  • New DOT rated heated glass window with embedded defroster wiring
  • Includes the wiring harness to connect the defroster window to electrical system
  • Flush mounted deck seams like original and unique to these Boxsters
Bestseller No. 3
Sierra Auto Tops Convertible Top Replacement for Porsche Boxster 1997-2002, Acoustic A5 Canvas, Black
  • Upgraded German A5B/DS Acoustic Cloth / Canvas for superior sound dampening
  • Entire top is cut from the same bolt of cloth for consistent color and pattern
  • Slightly tinted heavy gauge press-polish plastic window for superior visibility
  • Includes the wiring harness to connect the defroster window to electrical system
  • Flush mounted deck seams like original and unique to these Boxsters
Bestseller No. 4
compatible with Porsche Boxster Convertible Top With Plastic Window Black Canvas Cloth(1997-2002)
  • 1 Year Manufacturer Warranty
  • Canvas Cloth
  • Window: 50 Gauge Heavey Plastic window like the original
  • This top comes completely assembled and ready to install. No sewing is required
Bestseller No. 5
PB-3302-2 10-07-BOX-068 POR10025 Convertible Soft Top Heated Glass Window Fits Porsche 986 Boxster 1997-2002 Black
  • 🚗【Compatible with】Fully fits the original model. Compatible with Porsche Boxster 986 1997 1998 1999 2000 2001 2002.Part Number:MBZ1076845, BZ17054651, 0107-BLACK-STF; Manufactured to original quality specifications or better to ensure a perfect fit and long life.
  • Reliable and durable】Our soft top uses high quality waterproof fabric, which can easily resist outside rain, has certain function of preventing sun damage, and has excellent resistance to long-term exposure to the sun.
  • 🚗【Excellent Visibility】The Convertible Soft Top windows are made of high quality glass with heating wire, easy defogging and excellent visibility; and are resistant to high temperature, wear and tear, and easy to scrub.
  • 🚗【Easy to install】 Convertible Soft Top with Heated Glass Window is fully assembled and ready to install. No sewing is required.
  • 🚗【Buy with confidence】 1 year unlimited mileage warranty - We take your satisfaction very seriously and strive to provide you with an excellent shopping experience. Feel free to contact us with any questions and we will respond within 12 hours.

All Boxster Forum Sites will have multiple dedicated threads on this issue and offer many solutions for resolution.

Please note that Replacing the Convertible Roof is Project 70 in the 101 Projects for Your Porsche Boxster.

Boxstertips - 101 Projects for your Porsche Boxster
Boxstertips – 101 Projects for your Porsche Boxster
Boxstertips - Porsche Boxster Convertible Top Replacement
Boxstertips – Porsche Boxster Convertible Top Replacement

6.0 From Amazon

SaleBestseller No. 1
compatible with Porsche Boxster 986 1997-2002 Convertible Top With Heated Glass Window Canvas Cloth (Black)
  • Canvas Cloth
  • DOT Approved Heated Glass Window.
  • This top comes completely assembled and ready to install. No sewing is required.
  • Our tops are Brand new in the original box.
Bestseller No. 2
Sierra Auto Tops Convertible Top Replacement for Porsche Boxster 1997-2002, Acoustic A5 Canvas, Black
  • Upgraded German A5B/DS Acoustic Cloth / Canvas for superior sound dampening
  • Entire top is cut from the same bolt of cloth for consistent color and pattern
  • Slightly tinted heavy gauge press-polish plastic window for superior visibility
  • Includes the wiring harness to connect the defroster window to electrical system
  • Flush mounted deck seams like original and unique to these Boxsters
Bestseller No. 3
KUAFU Convertible Soft Top Compatible with 1997-2002 Porsche Boxster & Boxster S 986 2-Door w/Plastic Window Sailcloth Vinyl Black
  • Fitment: The Convertible Soft Top Compatible with 1997-2002 Porsche Boxster & Boxster S 986 Convertible 2 Door.
  • High Performance: Clear visibility of the windows will not obstruct your view and ensure safe driving. No sewing required on top, fully assembled and ready to install.
  • Premium Quality: The Soft Top is made of Sailcloth Vinyl & Plastic with high temperature resistance and not easy to deform. The strict splicing process provides effective protection against rain, wind and sun.
  • Package Included: Note: Mounting Hardware & Instructions NOT included. Only 1 x Soft Top with Plastic Window.
  • Installation Mode: Screw & clip. Professional installation is strongly recommended.
Bestseller No. 4
A-Premium Black Convertible Soft Top Compatible with Porsche Boxster 2005-2012, Convertible Only, Replace# 98756101500A10, 98756190302A10
  • [Vehicle Fitment]: Compatible with Porsche Boxster 2005-2012 Convertible (Black, with Glass Window)
  • [Specification]: ① Reference Number: 98756101500A10, 98756190302A10; ② Color: Black; ③ Window Material: Glass; ④ Installation Hardware Included: No; ⑤ Package Quantity: 1x Convertible Soft Top; ⑥ Packaging Type: Box
  • [First Quality]: Made of Superior quality waterproof fabric, it can not only easily resist external rain, but also wind and sun; Windows feature OEM quality laminated plastic for high visibility.
  • [Perfect Stitching Technology]: The top deck is made up of deck seams on both sides. All seams are heat sealed and reinforced with double pins. This bonding method adds strength so that it does not leak or separate during use, ensuring an excellent experience.
  • [Buy with Confidence]: A-Premium offers a one-year unlimited-mileage guarantee on our meticulously crafted Convertible Soft Top. We offer a wide variety of automotive accessory categories, ensuring that you can hit the road with peace of mind.
Bestseller No. 5
Sierra Auto Tops Convertible Top Replacement for Porsche Boxster 1997-2002, TwillFast RPC Canvas, Black, Heated Glass Window
  • Haartz TwillFast RPC acoustic canvas
  • Provides up to 2dB (noticeable) noise reduction
  • Defroster, tinted glass window upgrade
  • No Stitching or Piping around window
  • 5 year warranty to original owner
Bestseller No. 6
A-Premium Blue Convertible Soft Top Compatible with Porsche Boxster 1997-2002, Convertible, with Plastic Window
  • [Vehicle Fitment]: A-Premium Convertible top is compatible with Porsche Boxster 1997-2002 Convertible---Blue, with Plastic Window
  • [First Quality Cabrio Vinyl]: This 1 piece soft top design is an economical alternative for your vehicle, retaining the same quality as the original. Made of premium waterproof fabric, it can easily withstand external rain and prevent rainwater leakage, while providing wind and sun resistance.
  • [Superior Visibility]: The window uses the OEM quality press polish plastic for superior visibility; Strong bonding, no more window seperation; Made of transparent PVC material, high temperature resistance, wear resistance, easy to scrub
  • [Reference Number]: The A-Premium Convertible Soft Top's reference number: PR-2291-442-2994, PR22914422994. Before placing an order, verify that the part is compatible with your vehicle using the compatibility system.
  • [Buy with Confidence]: A-Premium offers a one-year unlimited-mileage guarantee on our meticulously crafted Convertible Soft Top. We offer a wide variety of automotive accessory categories, ensuring that you can hit the road with peace of mind.
Bestseller No. 7
Sierra Auto Tops Convertible Top Replacement for Porsche Boxster 1997-2002, TwillFast II Canvas, Blue
10 Reviews
Sierra Auto Tops Convertible Top Replacement for Porsche Boxster 1997-2002, TwillFast II Canvas, Blue
  • First quality Twillfast II cloth with a dobby weave lining
  • Precision cut with Gerber automated computer guided cutting equipment
  • DOT approved plastic window same as factory original
  • Includes new steel side hold down cables already securely installed on this top
  • Factory-style retainer attachments are sewn-in for an easy & accurate installation
Bestseller No. 8
Sierra Auto Tops Convertible Top Replacement for Porsche Boxster 1997-2002, German A5 Canvas, Black
  • Porsche OEM original German A5 Singed cloth material with black dobby weave (cross hatch) interior lining
  • Entire top is cut from the same bolt of cloth for consistent color and pattern
  • Slightly tinted heavy gauge press-polish plastic window for superior visibility
  • Flush mounted deck seams like original and unique to these Boxsters
  • Includes a new green tinted plastic window
Bestseller No. 9
Sierra Auto Tops Convertible Top Replacement for Porsche Boxster 1997-2002, German Acoustic A5 Canvas, Black
17 Reviews
Sierra Auto Tops Convertible Top Replacement for Porsche Boxster 1997-2002, German Acoustic A5 Canvas, Black
  • Upgraded German A5B/DS Acoustic Cloth / Canvas for superior sound dampening
  • Entire top is cut from the same bolt of cloth for consistent color and pattern
  • New DOT rated heated glass window with embedded defroster wiring
  • Includes the wiring harness to connect the defroster window to electrical system
  • Flush mounted deck seams like original and unique to these Boxsters

7.0 From the Internet:

Top 5 Recommended Boxster Web Forums (Excellent Resource for repairs and advice)

6SpeedOnline – Rear window ripped, now what?

PedrosBoard – Rear window replacement question for 986

8.0 Be Sure To Join Our FaceBook Group

Boxstertips - When Boxsters Dream
Boxstertips – When Boxsters Dream. Join our FaceBook Group

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Boxstertips - 13 Convertible Tips for Porsche Boxsters
Boxstertips – 13 Convertible Tips for Porsche Boxsters

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Last update on 2024-05-28 / Affiliate links / Images from Amazon Product Advertising API