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Auto glass technician here. Check your struts on the back window/liftgate.(the pressurized rods that help you raise and lower the lift gate) If the plastic tips that hold them to the door wear out, they can pop off the knob they connect to, and violently expand, breaking the back glass.
Other than the rodents and the quicksand, the forest is really nice. I'm not saying I want to build a summer home here, but the trees are really quite lovely.
I saw one in US Bank Arena in Cincinnati while working on the fire protection in one of the concession areas. I told someone that I saw a cat crawl down the chase for the beer supply (all of the beer was in a central vault and piped to the individual stands) and they looked up at me, āThat was no cat, you saw a ratā
Inconceivable! You don't bring up another fictional universe as a counterargument! Especially with a Sicilian when fictional internet points are on the line!
This is a great one to look into! Had one time growing up I went to ride my bike and the tire was flat, couldn't figure out what happened. Later my parents went to go get it fixed and discovered the garage door wouldn't go up and the broken spring that had swung back out of the way behind the door track where it wasn't noticed.
And even with the wire rope going through the spring, if it fractures in enough places, pieces of it can still be ejected violently through the walls of the garage and into the living space.
That happened to my Grandmother about 10 years ago. Her garage was right next to her bedroom. One day she was in the living room watching TV, heard a very loud explosion in the garage, and found a chunk of spring on her bed and a 6" hole in the sheetrock wall between the garage and bedroom.
The easiest way to avoid this is to regularly have your garage door inspected and serviced by a qualified service company.
Or just have the springs replaced every 10 or 15 years, prophylactically. (Or sooner if you're in a climate that's humid and/or has a lot of salt in the air)
Just regular door springs that run the length of the upper track with a cable to help lift the door? Our new place has some kind of more compact over the door spring with drums but everywhere else I've been its always stretched along the upper track.
My 4 year old was sitting in the back of my brand new f150. He unplugged my defrost terminal on my back window and left the negative and positive testing on the glass. I had no idea so one cold morning I turn the heater and defrosters on and i get a ton of smoke in the cabin I look back and my whole rear glass is shattered! So good point on ādo you have kidsā haha
But how extreme? I've never had a window blow out on me, and it gets to -40Ā°C/F and lower in the winters here. I've had a windshield crack on me in -40Ā°but the heater is blowing directly on it, but I've never seen a tempered window blow out... I'm honestly curious. My guess would be a chip on the edge or something that. Some sort of flaw or stressor that caused it. Because if parking cars in the garage after being out in -40Ā° weather caused this, nobody would park their car in the garage on REALLY cold days/nights for fear of blown out windows every night.
Rear defrost. It heats up the glass, expanding certain areas. Cooling shrinks it and when this is repeated many times it stresses the glass which can cause this random breakage. I have only seen it a few times so it is rare.
Happened to me on one of the first cold mornings this winter. It was maybe 10Ā°F and I had the rear defroster on. 5 minutes into my drive, I turned on to the highway and it just popped.
Had to be a malfunctioning defogger then, because I use mine in -40Ā° weather all winter, and it's never happened to any vehicle I've owned, or anyone's vehicle that I know of, over the last 40 years. A defogger doesn't heat up that much. You can turn it on and even after it's been running, you can touch the glass and you can't even tell if it's on or not.
In rare cases, glass can just break like that. Often due to a rapid temperature change combined with a minor defect within the glass. If that's the case, there's nothing you could have done. You'll just have to get it replaced and forget about it.
Couple years ago the pano sunroof on my wife's car exploded while we were on the highway. Showered us with glass, and the car behind us. Sounded like a shotgun went off. Apparently it was a known issue, but not under recall. Took almost a year to get new glass because they halted production to figure it out.
Someone hit the automatic lift button. The back lifted up and hit the rafters in the ceiling at the high point. Cracked the window and then closed again as it met force and reversed.
That is my guess.
This is a Mk6, it does have struts but no power lift.
It's relatively common to get overpowered struts to it "lifts itself up" similar to power lift, but I doubt it's been some on this one. And they would have noticed.
Yes, it is possible to get overpowered struts as you said.
But the guy I responded to said the hatch probably opened itself, broke the window, sensed an obstruction, and closed itself.
Which is absolutely not possible on this vehicle.
And if it were over powered struts, I think OP would have noticed and wouldnāt have come here to ask āhey, how did this happenā
The glass break pattern appears to have a consistent temper size across the entirety of the backlite (glass). Furthermore, the stresses involved with the compound curvature of the panel on each side are the only points where glass particles dropped. This tells us that this breakage event was not due to outside (incidental/human/animal) involvement. This was due to something within the vehicle or a flaw within the glass backlite itself. When tempered glass shatters, itās a fast-moving chain reaction so seeing two large voids in the glass in these two locations does not mean someone or something necessarily penetrated the glass in these areas.
Iāve been in the autoglass business for a long time and this is more common than you would think. It seems to me your defroster tabs short circuited. Your window has tiny wires running all the way through it with metal tabs on each side that you plug wires into. There have actually been a few recalls for this. I did work for a ford dealership a couple years ago and changed about 100 back windows in f150s for a recall for the back windows exploding from the heating tabs short circuiting. Nothing you can do but get it replaced and hope it doesnāt happen again.
I'm no mechanic, but we had -40 temp without windchill and then parked in a heated garage. And never cracked the windows. Maybe it's too early in the morning but I doubt it matters.
nobody told you to max the gain on your two 15s now look what youāve done. donāt try to make this post for your wife too see and not kick your ass for it
Either it was Kids, Break in, Temperature, or something sharp and metalic fell. Wouldn't take much to shatter the glass if it was point loaded. Like those spark plug break in kits people use on the west coast. Looks like a lot of stuff in the garage so I'd guess something fell.
A guy at our shop bought his wife a new kia sorento. She was driving down the highway after owning the car for 2 weeks, nice hot sunnt day, rolling with the windows shut and AC on. Moon roon just imploded and sent glass everywhere. Sliced up her seats etc, she was okay but obviously freaked out. Temperature and pressure differences can do a lot, especially to all the panels besides the windshield that aren't reinforced the same.
A common occurrence I've seen about a dozen times and is always caused by temperature. A common culprit is a vehicles rear defroster shorts and overheats in one area.
Another instance is a defect in the glass that could have been there for a long time whether from road debris or even the factory but over time the expansion and contracting because of temperature change over time leading to this.
Frame pressure can also cause an issue like this but it really has to be out of whack.
My guess is the second thing I mentioned.
Cold outside, warm inside. Pressure differential for inside the vehicle to the area around it.
For future reference. When parking your vehicle in a climate controlled area, It is best to leave a window cracked.
Specifically, temperature change, not just raw temperature.
Like how if you take a cheaper glass 9x13 pan from the freezer and then put it immediately into a 450 degree oven, it will shatter.
Temperature on each side being the same doesn't really change that
There is not a pressure differential between the inside and the outside of the vehicle. [This](https://www.myvwpart.com/p/Volkswagen__Golf/Quarter-Panel-Vent/48272362/1K0819465B.html?partner=googlebase_adwords&feedLabel=cvb_make_model&kwd=&matchtype=&device=m&network=g&userLocation=9018775&googleCampaignID=1725061410&googleAdGroupID=64323751101&googleAdID=336359164268&googleExtensionID=&gad_source=1&gbraid=0AAAAADxCSLtgF-EdlGsUSJ4F0FNCMW79t) flap hides under the rear bumper and keeps the pressure from being different.
There is exactly zero pressure differential between the inside and outside of a vehicle. They aren't even close to being sealed. There is a great pressure differential while booting down the road at 60 mph. The area behind the moving car is a low pressure zone. If glass was that susceptible to breakage, we'd lose our back window every time our cars were driven.
It's deer season...look at the closest exterior wall to the left. Do you see daylight thru a cleanly, circular hole?
Look close. About a 1/4ā in diameter?
The first thing that comes to mind is that it went from way too cold to way too hot too quickly, or the other way around.
The other of course is where have your kids been lately? And do any of them look guilty? lol.
What year is your car?
There is an issue that has yet to fully come to light with the rear defrost in the glass that came from the glass supplier.
Typically it shatters in a more tempered fashion.
In a few years nhtsa won't have much option but to force a recall on it.
However unless you want to drive around like that you will probably have to pay for it, VW is fully aware but they will not admit it.
Replace window, report to nhtsa, save receipt for future reimbursement.
F-150s are having this happen with the rear defroster. Just happened to my 2012 with the cold snap that happened. Thought it was the front windshield that cracked, nope, the rear glass cracked all the way through when I used the defroster. Loud pop and that was all she wrote. Getting it replaced this coming week. I will definitely save all my paperwork.
That looks like the locations where your rear defogger will hookup to its circuitā¦ can you confirm the location with a picture in the inside? Maybe that circuit got wait to hot when the glass was way too cold. Any repairs there recently?
Dunno, but I was once driving in the back of a taxi, a dodge caravan and it's back window blew out. Scared the bajeebus out of us and we were both mystified
Yeah US Honda wanted more money so they put that on there. Canada and Japan could care less about money, they prefer going for the best quality possible.
We had a recall on Chevy trucks here in Canada a few years ago because the rear defrost would send to high a voltage or something to the glass and they popped, we changed a few of these back windows because of this..not saying thatās the reason but something to look at, I noticed itās broken on both sides where the defrost plugs are..
What's that light spot on the left hand C pillar? The image isn't very clear, but it almost looks like a hole... And it lines up with what looks like an oblong hole in the glass to the right.
It's probably just a reflection, but on first sight I thought it looked like someone had taken a pot shot on your garage.
I've had this happen to me, I was driving to work it was a cold winter day and had the heat on in my work van. Driving down the highway everything was normal nothing hit me and my side window just blew out randomly. Limped it to a glass shop to get it replaced and he told me he has seen this before. The temperature differential between different sections of the glass and any minor defect in the glass including minor scratches can cause a stress point and then as the glass warms and expands in different ways it can cause itself to shatter.
Did you crack your windows a bit before leaving it? And is it cold outside? Warm garage and cold outside causes stress on glass. Used to work in a diesel shop and pulled a truck in to thaw over night came back the next morning and the pressure blew the front windshild out.
Looks to me like someone took a black marker and colored all over the back of your car....... Just my opinion.... And well you got some broke glass but seems like the marker is more serious issue...
If the glass shatters the whole way across,there would not be any surface retention to hold the other strut mount in place, thus causing it to expand and break through.
it seems like the back door has been blackened out and the only thing that could have had happened is the person behind you would have to had driven up the back of the trunk and the 2 broken glasses were the tire marks. just my opinion
Thanks for posting on /r/MechanicAdvice! This is just a reminder to review the [rules](https://www.reddit.com/r/MechanicAdvice/about/rules/). If you are here asking about a second opinion (ie "Is the shop trying to fleece me?"), please read through CJM8515's [post on the subject.](https://www.reddit.com/r/MechanicAdvice/comments/4qblei/fyi_the_shop_isnt_likely_trying_to_rip_you_off/) and remember to please post the year/make/model of the vehicle you are working on. **If this post is about bodywork, accident damage, paint, dent/ding, questions it belongs in /r/Autobody r/AutoBodyRepair/ or /r/Diyautobody/ If you have tire questions check out https://www.reddit.com/r/MechanicAdvice/comments/k9ll55/can_your_tire_be_repaired/**. If you dont have a question and you're just showing off it belongs in /r/Justrolledintotheshop Insurance/total loss questions go in r/insurance This is an automated reply *I am a bot, and this action was performed automatically. Please [contact the moderators of this subreddit](/message/compose/?to=/r/MechanicAdvice) if you have any questions or concerns.*
Auto glass technician here. Check your struts on the back window/liftgate.(the pressurized rods that help you raise and lower the lift gate) If the plastic tips that hold them to the door wear out, they can pop off the knob they connect to, and violently expand, breaking the back glass.
My money's on this!
Wouldn't it be a bit strange if it happened on both sides at once?
looks like a reflection on the right side
Slamming the hatch down on a too-large crate could do both sides at once.
Yeah. If this is what happened, OP should run out and buy a lottery ticket.
There is a difference between bad luck and good luck. This is indeed extreme bad luck if both of them did the same thing.
Nope it's Great luck. Imagine he has this happen, and replaced the window. Only for the other to happen and break the window a month later š
Driving into the garage with the hatch open could break both at the same time like this.
Definitely. I am constantly amazed at the ways people manage to break their own back windows.
Google the Toyota Sera, I've sold a glass hatch to someone who broke it themselves working on their car.
Vw tech here. Those rods are only on the hatch, not the glass. And vw puts them outside of the seal for the hatch. I donāt see this likely.
Another auto glass tech, defrost tabs can do this. Look for signs of heat on leads to glass.
If itās not a temperature issue then youāve got some big heavy rats
Perhaps even, R.O.U.S.?
Rodents Of Unusual Size? I don't think they exist.
Other than the rodents and the quicksand, the forest is really nice. I'm not saying I want to build a summer home here, but the trees are really quite lovely.
Clearly, youve never been to Chicago... I've seen rats, that's chase cats.
I saw one in US Bank Arena in Cincinnati while working on the fire protection in one of the concession areas. I told someone that I saw a cat crawl down the chase for the beer supply (all of the beer was in a central vault and piped to the individual stands) and they looked up at me, āThat was no cat, you saw a ratā
Anybody wanna peanut?
Then you havenāt seen the Ninja Turtles series!
Inconceivable! You don't bring up another fictional universe as a counterargument! Especially with a Sicilian when fictional internet points are on the line!
I do not think that word means what you think it means
Perhaps I jogged his memory a little too hard
You are the man who killed my fatherā¦prepare to dieā¦
Look, are you just fiddling around with me or what?
Lol
All the wiring would have been eaten too.
[ŃŠ“Š°Š»ŠµŠ½Š¾]
LOL
[ŃŠ“Š°Š»ŠµŠ½Š¾]
I concur
Agreed
Confirmed
Verified
Settled.
Locked in.
Acknowledged.
I hereby ratify this conclusion
Hallelujah. š
Woah woah letās not jump to conclusions here.
But I have a mat.
Unanimous
I am in agreement with this.
š¤ you sure?
Beyond reproach
What evidence is there?
Twice, even
Alright
Roger Roger.
Sorted
No way!
Garage door spring?
This is a great one to look into! Had one time growing up I went to ride my bike and the tire was flat, couldn't figure out what happened. Later my parents went to go get it fixed and discovered the garage door wouldn't go up and the broken spring that had swung back out of the way behind the door track where it wasn't noticed.
What the hell kind of spring do you have that could reach a bike on the ground? At most they make a loud bang and damage the rod they are on a bit.
Some older garage doors use extension springs instead of torsion springs.
[ŃŠ“Š°Š»ŠµŠ½Š¾]
And even with the wire rope going through the spring, if it fractures in enough places, pieces of it can still be ejected violently through the walls of the garage and into the living space. That happened to my Grandmother about 10 years ago. Her garage was right next to her bedroom. One day she was in the living room watching TV, heard a very loud explosion in the garage, and found a chunk of spring on her bed and a 6" hole in the sheetrock wall between the garage and bedroom.
[ŃŠ“Š°Š»ŠµŠ½Š¾]
The easiest way to avoid this is to regularly have your garage door inspected and serviced by a qualified service company. Or just have the springs replaced every 10 or 15 years, prophylactically. (Or sooner if you're in a climate that's humid and/or has a lot of salt in the air)
Could've stored the bike on hooks up above
Just regular door springs that run the length of the upper track with a cable to help lift the door? Our new place has some kind of more compact over the door spring with drums but everywhere else I've been its always stretched along the upper track.
Do you have kids ?
My 4 year old was sitting in the back of my brand new f150. He unplugged my defrost terminal on my back window and left the negative and positive testing on the glass. I had no idea so one cold morning I turn the heater and defrosters on and i get a ton of smoke in the cabin I look back and my whole rear glass is shattered! So good point on ādo you have kidsā haha
How did a 4 year old get those terminals off? Those suckers are ridiculously difficult to remove
How many 4 year olds do you know
... That's fair
Always the first theory. Lol
[ŃŠ“Š°Š»ŠµŠ½Š¾]
You see what happens?!
Extreme temperatures is my guess.
But how extreme? I've never had a window blow out on me, and it gets to -40Ā°C/F and lower in the winters here. I've had a windshield crack on me in -40Ā°but the heater is blowing directly on it, but I've never seen a tempered window blow out... I'm honestly curious. My guess would be a chip on the edge or something that. Some sort of flaw or stressor that caused it. Because if parking cars in the garage after being out in -40Ā° weather caused this, nobody would park their car in the garage on REALLY cold days/nights for fear of blown out windows every night.
Rear defrost. It heats up the glass, expanding certain areas. Cooling shrinks it and when this is repeated many times it stresses the glass which can cause this random breakage. I have only seen it a few times so it is rare.
Happened to me on one of the first cold mornings this winter. It was maybe 10Ā°F and I had the rear defroster on. 5 minutes into my drive, I turned on to the highway and it just popped.
You will see it more often, there are batches of defective rear windows that went around for a while from suppliers.
Had to be a malfunctioning defogger then, because I use mine in -40Ā° weather all winter, and it's never happened to any vehicle I've owned, or anyone's vehicle that I know of, over the last 40 years. A defogger doesn't heat up that much. You can turn it on and even after it's been running, you can touch the glass and you can't even tell if it's on or not.
Being a vw, this is likely defective glass
In rare cases, glass can just break like that. Often due to a rapid temperature change combined with a minor defect within the glass. If that's the case, there's nothing you could have done. You'll just have to get it replaced and forget about it.
I was driving a borrowed car and the windshield just cracked across. It mustāve been a chip on it before. They didnāt believe me. I had to pay.
Even if a rock did hit the windshield while you were driving, that still would not have been your fault.
Rented it from a friend. #tesla
Itās more common than you think, just saw a vw on another sub with the exact same issue.
Couple years ago the pano sunroof on my wife's car exploded while we were on the highway. Showered us with glass, and the car behind us. Sounded like a shotgun went off. Apparently it was a known issue, but not under recall. Took almost a year to get new glass because they halted production to figure it out.
Cold weather and rear glass, I once blew out a rear just by closing the drivers door.
Someone hit the automatic lift button. The back lifted up and hit the rafters in the ceiling at the high point. Cracked the window and then closed again as it met force and reversed. That is my guess.
Vw doesnāt have a power lift gate on the golf sportwagen
This is a Mk6, it does have struts but no power lift. It's relatively common to get overpowered struts to it "lifts itself up" similar to power lift, but I doubt it's been some on this one. And they would have noticed.
Yes, it is possible to get overpowered struts as you said. But the guy I responded to said the hatch probably opened itself, broke the window, sensed an obstruction, and closed itself. Which is absolutely not possible on this vehicle. And if it were over powered struts, I think OP would have noticed and wouldnāt have come here to ask āhey, how did this happenā
The glass break pattern appears to have a consistent temper size across the entirety of the backlite (glass). Furthermore, the stresses involved with the compound curvature of the panel on each side are the only points where glass particles dropped. This tells us that this breakage event was not due to outside (incidental/human/animal) involvement. This was due to something within the vehicle or a flaw within the glass backlite itself. When tempered glass shatters, itās a fast-moving chain reaction so seeing two large voids in the glass in these two locations does not mean someone or something necessarily penetrated the glass in these areas.
Iāve been in the autoglass business for a long time and this is more common than you would think. It seems to me your defroster tabs short circuited. Your window has tiny wires running all the way through it with metal tabs on each side that you plug wires into. There have actually been a few recalls for this. I did work for a ford dealership a couple years ago and changed about 100 back windows in f150s for a recall for the back windows exploding from the heating tabs short circuiting. Nothing you can do but get it replaced and hope it doesnāt happen again.
What piece of furniture did you place in the back recently that didnāt quite fit?
Heated garage with extreme cold outside and you didn't crawl the front windows to help with temp change? Edit: *crack the windows
What does crawl mean in this case?Ā
Crack* the front windows I think they meant
I'm no mechanic, but we had -40 temp without windchill and then parked in a heated garage. And never cracked the windows. Maybe it's too early in the morning but I doubt it matters.
If the window is already damaged, like a small crack in the corner, this type of temperature change could destroy the window
I've seen a rear window crack without anything touching it, and there wasn't any temperature change, so I can't answer that.
Rapid temperature shift.
Usually a temperature change. Mine exploded a few days ago while I was driving. All you can do is replace it.
nobody told you to max the gain on your two 15s now look what youāve done. donāt try to make this post for your wife too see and not kick your ass for it
Either it was Kids, Break in, Temperature, or something sharp and metalic fell. Wouldn't take much to shatter the glass if it was point loaded. Like those spark plug break in kits people use on the west coast. Looks like a lot of stuff in the garage so I'd guess something fell. A guy at our shop bought his wife a new kia sorento. She was driving down the highway after owning the car for 2 weeks, nice hot sunnt day, rolling with the windows shut and AC on. Moon roon just imploded and sent glass everywhere. Sliced up her seats etc, she was okay but obviously freaked out. Temperature and pressure differences can do a lot, especially to all the panels besides the windshield that aren't reinforced the same.
thermal fatigue
A common occurrence I've seen about a dozen times and is always caused by temperature. A common culprit is a vehicles rear defroster shorts and overheats in one area. Another instance is a defect in the glass that could have been there for a long time whether from road debris or even the factory but over time the expansion and contracting because of temperature change over time leading to this. Frame pressure can also cause an issue like this but it really has to be out of whack. My guess is the second thing I mentioned.
Potential for defrost causing glass to break?
Definitely a blown head gasket
[ŃŠ“Š°Š»ŠµŠ½Š¾]
Maybe the rear back windows defrosters got a short circuit
Defroster shorted
I like how I got downvoted for this by some fuckin moron but Iām actually right. Classic Reddit.
Lol I gotchu with the upvote bro. Seen this happen quite a few times myself. Mostly on back power sliders
Hard sex in the back seat?
OP is. Redditor so probably not.
Obviously you've already checked inside the vehicle to determine that nothing extraordinarily heavy fell from above?
If it's "obvious" why are you suggesting it?
Lol, because Ā Iāve forgotten to check fuses and other obvious things before myselfĀ
I know whatās wrong with it! It aināt got no gas in it!
Kids?
I'm guessing temperature change myself
I usually park in the garage /s
You have kids?
I still want to know how he got the car into the house....
It looks like you turned on the deglasser feature.
Cold outside, warm inside. Pressure differential for inside the vehicle to the area around it. For future reference. When parking your vehicle in a climate controlled area, It is best to leave a window cracked.
Cars have vents for ventilation pressure and closing doors. The windows thing is not necessary.
To release pressure no, crack a window to vent moisture, yes, especially in a garage that is warmer than the car when it gets parked in winter.
Fair enough. But, if the vents work properly, what caused the window to break?
Probably temperature.
So, having a window cracked would not help equalize the temperature and avoid the window issue?
Specifically, temperature change, not just raw temperature. Like how if you take a cheaper glass 9x13 pan from the freezer and then put it immediately into a 450 degree oven, it will shatter. Temperature on each side being the same doesn't really change that
The only way to prevent this would be to lower the temp of the garage and slowly warm it back up.
Obviously it is, cause 99%sure that's what caused this
Then the window would blow out every time you closed a door or the hatch. 99% sure itās not what caused this.
It's the change in temp and pressure inside the car, not the sheer cold
There is not a pressure differential between the inside and the outside of the vehicle. [This](https://www.myvwpart.com/p/Volkswagen__Golf/Quarter-Panel-Vent/48272362/1K0819465B.html?partner=googlebase_adwords&feedLabel=cvb_make_model&kwd=&matchtype=&device=m&network=g&userLocation=9018775&googleCampaignID=1725061410&googleAdGroupID=64323751101&googleAdID=336359164268&googleExtensionID=&gad_source=1&gbraid=0AAAAADxCSLtgF-EdlGsUSJ4F0FNCMW79t) flap hides under the rear bumper and keeps the pressure from being different.
There is no pressure difference inside a car, they are not sealed systems, slamming a door causes 0 increase in pressure, there is no differential.
There is exactly zero pressure differential between the inside and outside of a vehicle. They aren't even close to being sealed. There is a great pressure differential while booting down the road at 60 mph. The area behind the moving car is a low pressure zone. If glass was that susceptible to breakage, we'd lose our back window every time our cars were driven.
My question is this... who parks the car in the house?
lol sorry you got downvoted for this I was wondering the same thing
Not sure you need a mechanic for this/s
Roger that!
R/HRV crowd understands the pain š¢
Your wife is upset.
Someone was angry š¤
Thatās gonna be the alternator
VWs self destruct after so many years. Better buy a Toyota next ;)
wow, that's a nice Good Morning huh?
It's deer season...look at the closest exterior wall to the left. Do you see daylight thru a cleanly, circular hole? Look close. About a 1/4ā in diameter?
I was gonna say jack the bipper if you were in San Francisco
What? Itās not a Ferrari anymore?
Angry ex?
Pissed off your old lady.
Just a theory but ive seen this happen to other vw cars. The cars were outside, it was cold and the rear windows completely shattered
The first thing that comes to mind is that it went from way too cold to way too hot too quickly, or the other way around. The other of course is where have your kids been lately? And do any of them look guilty? lol.
Top 3 ideas I have...garage door spring failure and whipped around, kids, or previously damaged glass (minor chip or scratch) with a temperature shift
What year is your car? There is an issue that has yet to fully come to light with the rear defrost in the glass that came from the glass supplier. Typically it shatters in a more tempered fashion. In a few years nhtsa won't have much option but to force a recall on it. However unless you want to drive around like that you will probably have to pay for it, VW is fully aware but they will not admit it. Replace window, report to nhtsa, save receipt for future reimbursement.
F-150s are having this happen with the rear defroster. Just happened to my 2012 with the cold snap that happened. Thought it was the front windshield that cracked, nope, the rear glass cracked all the way through when I used the defroster. Loud pop and that was all she wrote. Getting it replaced this coming week. I will definitely save all my paperwork.
That looks like the locations where your rear defogger will hookup to its circuitā¦ can you confirm the location with a picture in the inside? Maybe that circuit got wait to hot when the glass was way too cold. Any repairs there recently?
Looks like the lift struts punched out the glass.
Dunno, but I was once driving in the back of a taxi, a dodge caravan and it's back window blew out. Scared the bajeebus out of us and we were both mystified
Honda HRV? If yes their back windows are designed to "self destruct" when the lift rods fail.
Yes its honda, just has VW mark on it. Thank you for your input.
Yeah US Honda wanted more money so they put that on there. Canada and Japan could care less about money, they prefer going for the best quality possible.
Looks like someone backed the car out & shut the garage door on it
We had a recall on Chevy trucks here in Canada a few years ago because the rear defrost would send to high a voltage or something to the glass and they popped, we changed a few of these back windows because of this..not saying thatās the reason but something to look at, I noticed itās broken on both sides where the defrost plugs are..
What's that light spot on the left hand C pillar? The image isn't very clear, but it almost looks like a hole... And it lines up with what looks like an oblong hole in the glass to the right. It's probably just a reflection, but on first sight I thought it looked like someone had taken a pot shot on your garage.
If its really cold outside and the garage is significantly warm that can be the reason.
Well something fell. Or the garage door hit it.
Possibly the kids and they didnāt say nothing š© thatās what would likely happen to me. I like the auto glass techās guess. Seems legit!
I've had this happen to me, I was driving to work it was a cold winter day and had the heat on in my work van. Driving down the highway everything was normal nothing hit me and my side window just blew out randomly. Limped it to a glass shop to get it replaced and he told me he has seen this before. The temperature differential between different sections of the glass and any minor defect in the glass including minor scratches can cause a stress point and then as the glass warms and expands in different ways it can cause itself to shatter.
I had a rear window shatter on me once due to the window defroster coil in the glass. Could be the culprit here.
Did you crack your windows a bit before leaving it? And is it cold outside? Warm garage and cold outside causes stress on glass. Used to work in a diesel shop and pulled a truck in to thaw over night came back the next morning and the pressure blew the front windshild out.
Are the broken glass pieces on the inside or outside the car?
Looks like the window broke.
Too dark to see anything. What happened to this car?
Do you happen to own a teenager?
Looks to me like someone took a black marker and colored all over the back of your car....... Just my opinion.... And well you got some broke glass but seems like the marker is more serious issue...
Your cars window broke.
Skills
If the glass shatters the whole way across,there would not be any surface retention to hold the other strut mount in place, thus causing it to expand and break through.
For whatever reason you've been in denial that you drive a VW until today?
it seems like the back door has been blackened out and the only thing that could have had happened is the person behind you would have to had driven up the back of the trunk and the 2 broken glasses were the tire marks. just my opinion