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demister blew out windshield!! 

 

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 Post subject: demister blew out windshield!!
Posted: Fri Jun 28, 2013 10:19 pm 
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hey guys, as the subject states the demister on the rear windshield went bang and shatterd the entire windshield...any ideas why this would happen? when i pulled over to look at it, the glass above the connecter on the drivers side had been blown out...any ideas why this would happen?
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 Post subject: Re: demister blew out windshield!!
Posted: Sat Jun 29, 2013 7:09 am 
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Sounds like the glass must have been super cold and as soon as heat was applied it shattered.
Hence never poor warm or hot water over iced up windscreens. Same result.

 

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 Post subject: Re: demister blew out windshield!!
Posted: Sat Jun 29, 2013 2:38 pm 
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i probably should have mentioned that the demister was on for about an hour before hand...and only 3 or 4 or the lines actually worked
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 Post subject: Re: demister blew out windshield!!
Posted: Tue Jul 02, 2013 2:27 pm 
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if only a few of the elements work there would have been much more current going through them, and therefore more heat which would have caused uneven heating and expansion of the glass and then bang!

 

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 Post subject: Re: demister blew out windshield!!
Posted: Sat Aug 03, 2013 8:24 pm 
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Do these things actually work? The one on my EL is useless, after like 30 minutes I've got like 10cm of usable space to look out of.
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 Post subject: Re: demister blew out windshield!!
Posted: Sat Aug 03, 2013 8:41 pm 
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Damoo wrote:
Do these things actually work? The one on my EL is useless, after like 30 minutes I've got like 10cm of usable space to look out of.



means some of the heater circuit isn't working
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 Post subject: Re: demister blew out windshield!!
Posted: Sat Aug 03, 2013 10:27 pm 
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JOSE wrote:
if only a few of the elements work there would have been much more current going through them, and therefore more heat which would have caused uneven heating and expansion of the glass and then bang!

Hi,

How can this be ? There is 12 volts across it regardless of how many elements work or don't. There will be less heat in total if several element are faulty.

 

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 Post subject: Re: demister blew out windshield!!
Posted: Sat Aug 03, 2013 11:29 pm 
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correct, but the effects of the uneven heating can still shatter glass. your car is close to 20 years old now so the rear windscreen has gone through a lot of shock,vibration and heating/cooling cycles.

 

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 Post subject: Re: demister blew out windshield!!
Posted: Sun Aug 04, 2013 9:38 pm 
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no of BMW volvo etc that have done same thing - normally due to driving thru COLD patch of air with hot screen....
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