Help! What smashed my back windscreen? - Renault Forums :: Independent Renault forum

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post #1 of 5 (permalink) Old 8th December 2008 Thread Starter
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Help! What smashed my back windscreen?

Driving home on Friday night (around half midnight) my heart almost jumped in to my mouth as the back windscreen exploded under its own accord.

Flakes of glass cracked off on to the road and a whole load in to the boot. When I closed the drivers door (are gently as possibly) most of the glass caved in.

I went and had a look around to see if there were any groups of kids hanging around (incase a stone or pellet had been shot) but there were no signs.

I had the heated rear screen on like every night, but Friday night was only 2 degrees whereas I've had it on every other night recently at as low as -4. I polished the car last weekend and noticed no blemishes or chips in the glass.

I took it to Autoglass on Saturday and they had a new windscreen fitted on Sunday. They couldn't identify the problem but suggested that perhaps the thermostat is broken and the heater overheated the cold glass.

I bought some touch up paint and primer etc. for Flame Red in Halfords and will start hiding the scratches when I get time to clean it.

So, has anyone got any ideas what could have caused this? I've heard reports from friends that this has happened to their Renaults due to poor fitting, could this be true? We've had the car for 2 years. I'm anxious that it may happen again. I think I'll get a local garage to check the electrics now that I know the glass it properly fitted.

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Last edited by Modus-91; 8th December 2008 at 01:58 PM. Reason: Removal of photo with reg. plate
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post #2 of 5 (permalink) Old 8th December 2008
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seems a problem on a number of modern cars unexplained screen damage.

Early models of the Megane II suffered from this or rear screens just falling out due to problems with the bonding adhesive.

Possibly worth a call to Renault customer services ask for their input , whether they admit to issues is another thing
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post #3 of 5 (permalink) Old 8th December 2008
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IIRC the Lag II sport tourer also has this problem happen , but wasnt that due to the boot struts / rear window opening mechanism or something ?

Im sure I've read posts on here RF before about this on the LAg II sport tourer
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post #4 of 5 (permalink) Old 8th December 2008
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not good Modus

My Mrs has a Modus, like you she uses the heated rear screen frequently and no sign of trouble so far.

It might be an idea to blank out your reg plate in the photo's, oh and that other forums web address
post #5 of 5 (permalink) Old 8th December 2008
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I have heard of such cases and it may be down to the fact that the sealant around the window becomes hard and inflexible at low temperatures and the glass is unable to move when it expands. Apparently this is more likely to occur where there has been consistent low temperatures over a number of days. Additionally could there have been a gap in the sealant and moisture was able to get in and freeze thus creating undue pressure on the edges of the glass.
I wonder how this affects our poor northern european cousins though. It is also possible the glass may have been stressed at some point when the boot door was closed against something in the boot.
Having said that I have witnessed the sliding sunroof of a Peugot shatter on a warm day when the drivers door was slammed shut.
Weird thing is that glass is classified as a liquid and has some very strange qualities
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