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Old 02-14-2014, 02:02 PM   #1
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Defroster cracked my windshield

The other morning I was driving for about an hour in sub-zero temperatures with my defroster full blast. All of the sudden the windshield cracked from the passenger side all the way to the driver side post. Unless something fell from the sky, I would say the heater cracked it. The heater is hot as he!!, but could it be hot enough to crack the glass?
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Old 02-14-2014, 02:07 PM   #2
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I have heard of it happening.

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Old 02-14-2014, 02:13 PM   #3
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Happened to me before. Was lazy and didnt' want to brush the snow off my windshield. Put the defrosters on full blast and when I came back out there was a crack going from end to end. I did have a very tiny chip in it though too and that's where it looked like it started from
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Old 02-14-2014, 02:59 PM   #4
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Living in the north since 50 years, I will say that they dont crack by themselfs ( I may get a lot of s.....) saying this. It did happen to me twice, but I was always able to pinpoint it to a small hit somewhere. There is a need for a weak point somewhere for it to happen, but who knows, may be from factory... Still, try to fight it.
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Old 02-14-2014, 03:15 PM   #5
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Living in the north since 50 years, I will say that they dont crack by themselfs ( I may get a lot of s.....) saying this. It did happen to me twice, but I was always able to pinpoint it to a small hit somewhere. There is a need for a weak point somewhere for it to happen, but who knows, may be from factory... Still, try to fight it.
Jk windows suck and have hears of many cracking for no reason
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Old 02-14-2014, 03:16 PM   #6
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You know you drive a Jeep when........................
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Old 02-14-2014, 03:20 PM   #7
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You know you drive a Jeep when........................
That's a thread in itself.....
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Old 02-14-2014, 03:29 PM   #8
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Same thing happened to me about a week after I picked mine up. Turned it on in the garage to warm up and came out 10 minutes later to a crack all the way across. Dealer repaired under warranty. They did look long and hard for a chip or starting point like Michel347 said. They had flashlights out and a guy holding a piece of paper on the other side. Found nothing and finally replaced.
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Old 02-14-2014, 08:29 PM   #9
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Do you think there is any difference in OEM and after market windshields? A local shop quoted $150 to replace it with after market glass. I didn't ask a price for OEM.
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Old 02-14-2014, 09:22 PM   #10
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The jk windshield is flat, so should be no real quality issues with aftermarket. You only need to worry about aftermarket glass with a lot of bend or sag / shape to it.
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Old 02-14-2014, 10:31 PM   #11
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Last week it was 17 degrees over here and my windshield started to fog a little to a cranked up the defrost to high and soon after my windshield cracked at the bottom. There were no cracked at all before this.
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Old 02-15-2014, 04:10 AM   #12
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Living in the north since 50 years, I will say that they dont crack by themselfs ( I may get a lot of s.....) saying this. It did happen to me twice, but I was always able to pinpoint it to a small hit somewhere. There is a need for a weak point somewhere for it to happen, but who knows, may be from factory... Still, try to fight it.
agreed some where there is a stone chip or a flaw in the windshield. If it were something that just happen it would effect most of the vehicles--not just a few. I have thought mine cracked for no reason before but when I did a detailed inspection of the crack there was always a little stone chip where it started--sometimes so small you could just feel it before you saw it
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Old 02-15-2014, 05:49 AM   #13
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The jk windshield is flat, so should be no real quality issues with aftermarket. You only need to worry about aftermarket glass with a lot of bend or sag / shape to it.
Aftermarket quality should not be an issue. But be sure it comes with all the Jeep logos and shaded areas. Some don't.
I actually upgraded my WJ (Grand Cherokee) windshield from the factory one. Got it with the built in blue sunshade across the top thats, from the outside black. Looks way better and does a great job with low sun conditions. Factory had the AS arrows but no actual shading.
Hides all my transponders for tolls completly from the outside.
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Old 02-15-2014, 06:20 AM   #14
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Just go with the after market glass. This will not be the last windshield you buy.
I have heard of this happening but to me it has aways happened when I did not get
a chip repaired quick enough. In the summer when it is hot and you wash it with cold
water this can happen as well. It is just a drastic temperature change and a weak spot.
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Old 02-15-2014, 06:56 PM   #15
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A lot of after market windshields are Chinese copies of oem. Sometimes thinner different tint and some distortion. Be very careful. I went through 2 windshields for a Subaru that the installer admitted was Chinese crap. I then insisted on oem which was 500 more.
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Old 02-15-2014, 06:59 PM   #16
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Also there is a 2 or 3 digit number on the glass for country of origin.
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Old 02-17-2014, 07:37 AM   #17
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Here is an interesting link on the markings on auto glass:

TRIPLEX - Autostikli, Autostiklu serviss - Marking of the car window glasses

Also keep in mind when going with non-OEM. If you have auto A/C there is a sensor on the dash that measures sun intensity.. If the windshield you put in has a different tint that sensor will get inaccurate readings.
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Old 02-20-2014, 12:41 AM   #18
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Going with the after market glass in the morning for $150 installed.
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Old 02-20-2014, 12:44 AM   #19
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Had an after market Honda Ridgeline windshield installed at this same shop and seemed too be quality glass.
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Old 03-11-2015, 05:13 PM   #20
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Defroster cracked mt Jeep Wrangler windshield

On Feb 28 th my defroster was on high due to snowing and my windsheild cracked. I came on this site and saw how others had same problem. My insurance agent contacted a wind shield company to replace it, but found out that manufactur has it on back order until end of April. Yet Jeep has no recall issued?? I had my jeep in for running hot and told them about this site and how dealership claims a rock chip. They looked and I asked them do you see a rock chip? No one said yes or no, just that windshields only have 12 month warranty. Guess what, on my repair papers they put that I had a rock chip. I had my insurance check it out on Monday March 2, and they didn't see a rock chip. I believe Jeep needs a recall. Last vehicle I will purchase from this dealership in Columbia, Il. Also this was a new 2014 unlimited Jeep Wrangler with lots of extras and not cheap!!
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Old 03-11-2015, 05:21 PM   #21
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Welcome to the World of Jeeps and Windshields. They are a flat (relatively) piece of glass traveling down the road at 55+ mph. They crack.

You also say that you had the defrost on high. You put a lot of heat on a cold price of glass and it cracked. That will happen.

You also said that you don't see a chip. It doesn't take a large chip, especially when you add heat to cold glass.

In short, it ain't a Jeep problem and in all likelihood doesn't merit a recall.

Sorry to rain on your parade.
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Old 03-11-2015, 05:28 PM   #22
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Welcome to the World of Jeeps and Windshields. They are a flat (relatively) piece of glass traveling down the road at 55+ mph. They crack. You also say that you had the defrost on high. You put a lot of heat on a cold price of glass and it cracked. That will happen. You also said that you don't see a chip. It doesn't take a large chip, especially when you add heat to cold glass. In short, it ain't a Jeep problem and in all likelihood doesn't merit a recall. Sorry to rain on your parade.
I agree lol recall for a rock chip? Doh!!!!
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Old 03-11-2015, 05:34 PM   #23
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I don't understand why this would be a recall issue? Jeep should replace everyone's windshield, even those which aren't cracked? Why?

Plus, I think the point having been made here that the JK's heater can put our quite a bit of heat, is a good one. Setting it to MAX, and having all that heat blasting at the cold windshield might be asking for something to happen.

I had to go to work a few mornings this past winter with temps around zero, and once the engine warmed up, I had to turn the heat down. I can't imagine anyone keeping it on full max for their entire commute.
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Old 03-11-2015, 05:34 PM   #24
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Excuse my naivete as a tj owner. But our Windshield are not fundamentally very different, and yet there's not nearly as many over in our section mentioning this. In fact I've never seen one of these threads in the couple years I've been over there on this forum. My windshield is 12 years old(original) and never had cracked. Just Curiosity as to why this may be?
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Old 03-11-2015, 05:42 PM   #25
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Just an FYI, no matter how much snow/ice is on the windshield, always clean a part of it off.... Just scrape something off to allow the defrost to have a spot to start doing it's job, And also, the back defrost with the heat tape across the window, clean a patch off to allow the heat to dissipate... I've seen a few over my years that just shattered due to the heat being kept in because of ice. The heat has no where to go when it's covered with a snow blanket...Fronts are normally cased by a chip then when heated, crack.
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Old 03-11-2015, 08:02 PM   #26
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Oem

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Do you think there is any difference in OEM and after market windshields? A local shop quoted $150 to replace it with after market glass. I didn't ask a price for OEM.
My daughter had her JKU windshield done and asked for a OEM, she had to add $60. to whatever the insurance company paid. Her JKU is a '10 and had no fancy art work.

I'm not convinced the OEM's are better and as far as the art work on my '12 I'm not sure it's worth $60 bucks or more. Actually have a crack like being described from a tiny chip and heater now causing the "creep"! So I'll be making that decision soon, Jeep Grille and a little JK crawling rocks? I'm a Scotsman so probably choose plain and not OEM!!

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Old 03-11-2015, 08:42 PM   #27
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That happened to my wifes jeep in the ice storm. Went right across the entire windshield. She said she saw the crank go from one side to another.
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Old 03-11-2015, 08:47 PM   #28
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My brothers 2013 just cracked. 2 years 30k miles and nothing. Then driving through a snow storm we put his defroster on with the heat on high and the fan about half power. Within minute the window had cracked in the center bottom. First issue his Jeep has ever had. Well now I know for my Jeep not to run the defroster any hotter than half way, right between the blue and red or run the risk of cracking the window.
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Old 03-11-2015, 09:12 PM   #29
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My brothers 2013 just cracked. 2 years 30k miles and nothing. Then driving through a snow storm we put his defroster on with the heat on high and the fan about half power. Within minute the window had cracked in the center bottom. First issue his Jeep has ever had. Well now I know for my Jeep not to run the defroster any hotter than half way, right between the blue and red or run the risk of cracking the window.
while weird things can always happen I've always ran my defroster full on once it's warmed up. I would chock this one up to bad luck or you may have had a small chip from a rock and never noticed.
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Old 03-11-2015, 09:38 PM   #30
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Another member here mentioned a while back to use clear nail polish on chips to keep them from spreading. Our last to winter trips to Colorado, we got chips from rocks and I did the nail polish trick. Neither has spread at all. The first one is well over a year old.

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