Unlike a chipped windshield, where the crack starts from the point of impact and slowly spiders out over time, these cracks are developing quickly and often starting at the bottom of the windshield where the wipers are located.
An acoustic windshield has more sound dampening capabilities than a normal windshield. The added layers of soundproofing can make a significant improvement to reducing wind, tire, and other outside noise while driving.
It's a nice improvement but they might not be all they're cracked up to be considering complaints about this problem took a steep turn around the same time Subaru made the switch to acoustic windshields.
During a warranty extension to 2015 and early production 2016 Legacy and Outback vehicles, Subaru explained that certain compounds used to adhere the deicer to the lower portion on the windshield created a situation where "the glass become more susceptible to cracking following a minor wound" due to some outside force.
Another possible explaination is the thickness of the windshield glass itself.
Subaru vehicles tend to get good gas mileage, but glass is heavy and shaving a few pounds off can boost a car's MPG ratings. Glass is also expensive and so shaving off a few pounds can also boost the CEO's net worth.
Implications of a Constantly Cracking Windshield ∞
Cracked windshields are expensive enough to replace on their own. But, according to many owners, the costs don't stop with the glass.
EyeSight needs to be recalibrated when the windshield is replaced. And Subaru won't do that for free.
It can interfere with the proper deployment of airbags and can reduce the structural integrity of a vehicle in a crash.
All of which is to say, you need to get it replaced quickly. And that's not cheap.
TSB Leads to a Warranty Extenstion for Certain Outback and Forester Vehicles ∞
In TSB #12-192-15R, Subaru acknowledged that the "ceramic materials used for the black-colored printed perimeter combined with the silver-colored material used for the wiper deicer portion of the windshield glass" is the root cause of many windshield failures.
Subaru offered a "quality assurance" program by extending the windshield warranty from 3 years/36,000 miles to 5 years/unlimited mileage for 2015 and early-production 2016 Legacy and Outback vehicles.
Subaru also offered reimursement options for owners who had previously paid for repairs, but eligibility requirements made it nearly impossible to receive full reimbursements. They also refused to reimburse anyone who used a 3rd party, like companies their insurance might have suggested, if the company didn't replace the windshield with OEM glass.
The deadline for reimbursemnts passed on February 1st, 2016.
A Series of Lawsuits Says Subaru Didn't Go Far Enough ∞
Since the extended warranty was offered to just a couple 2015 models, Subaru has faced multiple lawsuits regarding their outright refusal to cover the cost (and related costs) of numerous windshield replacements in newer models.
These points were reinforced a few months later in Leon v. Subaru which added the 2020 model year, as well as the Ascent, Crosstrek, Impreza, and Legacy models.
The plaintiff argued that it was Subaru's switch to "acoustic glass" that is to blame for the multitude of failures.
And that contacting Subaru for reimbursements has been a "waste of time."
The Lawsuits Were Consolidated to Present a Stronger Case ∞
Both the Leon and Powell cases were consolidated into one class-action covering roughly 2.5 million vehicles:
2017-2020 Subaru Forester
2017-2020 Subaru Outback
2017-2020 Subaru Crosstrek
2017-2020 Subaru Legacy
2017-2020 Subaru Impreza
Unfortunately the Ascent was dropped from the list.
In March of 2020, Subaru asked for a motion to dismiss saying the cases do not allege that Subaru vehicles fail to comply with federal safety standard #205.
They also claim the cases are too broad and consist of "two different design generations of four of those five models." Which is a problem for the case's credibility because Subaru used multiple windshield suppliers over that period of time.
Of course, that could just mean they were all incompetent but that is up to a judge now.
This problem has popped up in the following Subaru generations.
Most years within a generation share the same parts and manufacturing process. You can also expect them to share the same problems. So while it may not be a problem in every year yet, it's worth looking out for.
The 2019 Subaru Forester was less than a week old. I was driving down the road, no one or nothing near me, and I heard a pop. I then saw the crack in the windshield ... I found other reports of windshield issues, took the information to the dealer, and they reluctantly replaced the windshield.
Because I have the Eyesight feature, I cannot replace the glass with aftermarket glass. It has to be OEM glass from the dealership. The glass is thin (2 layers sandwiching a thin film for noise reduction) and brittle resulting in the exterior layer cracking easily. Owning a Toyota for 15 years.... no cracked or broken windshields. Owning a Subaru 3 months... 2 cracked windshields.
Six days after I bought a 2019 Subaru Outback, I noticed a crack developing from the top on the driver's side, close to the middle of the car. I thought it was a small streak of water at first. But as it didn't dry, I realized the windshield had cracked. I didn't see or hear anything hit it. No trucks around, and the road was smooth, free of debris.
OK, Now What?
Maybe you've experienced this problem. Maybe you're concerned you will soon. Whatever the reason, here's a handful of things you can do to make sure it gets the attention it deserves.
File Your Complaint
CarComplaints.com is a free site dedicated to uncovering problem trends and informing owners about potential issues with their cars. Major class action law firms use this data when researching cases.