Defroster breaks windshield - Page 3 - JeepForum.com

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post #31 of 38 Old 12-06-2006, 10:20 AM
bluejeep2088
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i just use the regular window cleaner already in the jeep. Anything wet hitting that small amount of ice will melt it, then push away with the wipers.

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post #32 of 38 Old 12-06-2006, 12:17 PM
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My cousin had the opposite happen in the summer. He was washing his car in the summer heat. When the cold water hit the windshield it shattered. So yeah, temperature extremes will kill a windshield.

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post #33 of 38 Old 12-06-2006, 01:39 PM
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Wow. Interesting.
In over 30 years and dozens of vehicles I've owned I've never had (or seen) that happen. Even when I lived in Canada. And I'm a toss hot water on it kind of guy. I always thought that was a myth - no one I've ever met has actually had this happen or actually seen it happen. (Everyone seems to have heard a story, but never firsthand...) And No, I'm not calling BS, I'm admitting to learning something new!

Maybe I'll quit doing the hot water thing now...


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post #34 of 38 Old 12-06-2006, 02:39 PM
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Quote:
Originally Posted by Fargo
My cousin had the opposite happen in the summer. He was washing his car in the summer heat. When the cold water hit the windshield it shattered. So yeah, temperature extremes will kill a windshield.

That's what happened with my Lincoln LS only I wasn't washing it? It was hotter then he** outside and I had the air on and the window just cracked while sitting in a parking lot! Scared the crap out of me!

And as far as winter goes, just do what was mentioned earlier and you "shouldn't" have a problem, turn the defroster on as soon as you start the car.
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post #35 of 38 Old 12-06-2006, 05:01 PM
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Quote:
Originally Posted by BlueFlame
Wow. Interesting.
In over 30 years and dozens of vehicles I've owned I've never had (or seen) that happen. Even when I lived in Canada. And I'm a toss hot water on it kind of guy. I always thought that was a myth - no one I've ever met has actually had this happen or actually seen it happen. (Everyone seems to have heard a story, but never firsthand...) And No, I'm not calling BS, I'm admitting to learning something new!

Maybe I'll quit doing the hot water thing now...
I was the same way until last winter. I turned the defroster on to get rid of a little frost (engine was cold when I turned it on and went inside for a sec). When I came out, I had a 6 inch long crack in the windshield. It has since grown from the bottom of my windshield to the top...
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post #36 of 38 Old 12-06-2006, 05:08 PM
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Originally Posted by james509
Have you ever heard of this before? I was setting in my 2005 X letting the ice melt on the windshield the other night, and heard a sharp snap. The glass broke right where the defroster was blowing on it. I have a 5 or 6 inch long crack now. Has this happen to anyone else?
I had it happen to me in Snowshoe, WV on my old Buick Station Wagon. Cold windshield with ice on it, to lazy to clean it off with a scraper, so I started it up and turned on the defroster on high and walked back inside. Ten minutes later and I had a crack the entire length of the window.

I'm waiting for the LJ's windshield to crack this week. I've got three big chips in the windshield and all it will take is a good temperature differential for those chips to connect.

I guess the moral of the story is to clean off the windshield first and only use the defroster on the cool and warm settings. It seems to work for me.

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post #37 of 38 Old 12-06-2006, 05:18 PM
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the reason the A/C turns on when you hit the defroster is to keep it lubricated and running properly for use in the summer. it's only on for about a minute or 2.

I read that in a owners manual yeras ago when I had my first XJ. I've had 3 Jeeps since then and they all have done the same thing. 2XJ's, 1 TJ and the wife commmander all.

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post #38 of 38 Old 12-06-2006, 06:00 PM
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Quote:
Originally Posted by solarpower
the reason the A/C turns on when you hit the defroster is to keep it lubricated and running properly for use in the summer. it's only on for about a minute or 2.

I read that in a owners manual yeras ago when I had my first XJ. I've had 3 Jeeps since then and they all have done the same thing. 2XJ's, 1 TJ and the wife commmander all.

reason number 321354681321356003 why I like Jeeps. advanced engineering.(ok not always)

No, it's not.
The reason A/C comes on with defrost (or should be turned on for defrost in cars where you can manually switch the a/c on whenever you want) is because it improves the defogging ability about 6000%. The A/C is an excellent dehumidifier - a side effect of how it works causes it to remove moisture from the air. In cool damp climates, or with a carload of people, especially wet people, a defroster with no a/c will have a very hard time keeping the windows clear - if it even can. (Same thing with using recirc by the way.) Any time you see a car with badly fogged up windows going down the highway, you can bet good money they have selected recirc, and if they have a separate A/C switch its probably off. And in the morning when the defroster is having a tough time defogging the inside of the glass - just switch on that A/C and presto! it clears in seconds!

And it's not "only on for a minute or two." There is nothing in the control circuit for that. It will kick on and off according to a thermostat in the plenum (keeps it from freezing up the evaporator) and/or a pressure switch (also keeps from freezing up, and from overpressuring and blowing a hose.)


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