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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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Quote:
Originally Posted by Michel347 View Post
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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Originally Posted by al_safety View Post
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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