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DocT
Newbie


Joined: 31 Oct 2007
Posts: 8



PostPosted: Sun Nov 04, 2007 4:26 pm    Post subject: Blistering around windscreen Reply with quote

Guys!

A car that I've just had a look it has some (although not extensive) blistering around the windscreen. Does anyone know if this is a common problem with the 964 and how easy is it to fix?

Cheers for all your advice!

James
 
  
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Boxsey
Watkins Glen


Joined: 28 Jan 2007
Posts: 2232
Location: Part of the NorthWest Crew

1990 Porsche 964 Carrera 2

PostPosted: Sun Nov 04, 2007 10:31 pm    Post subject: Reply with quote

From what I read when researching to buy, this occurs after a bad windscreen replacement. It's rectified by having the windscreen out and a good bodyshop doing the repairs.

It might be one to avoid Confused
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smtk
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Joined: 23 Jul 2004
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PostPosted: Sun Nov 04, 2007 11:10 pm    Post subject: Reply with quote

common fault, poor design by Porsche. Depending on where the rust is you may have to blend into the roof.


Just had the rear screen bubbles done on mine
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Seagull
Estoril


Joined: 22 Aug 2005
Posts: 3712



PostPosted: Mon Nov 05, 2007 12:54 pm    Post subject: Reply with quote

It's important to catch it early otherwise it's a case of chopping the corroded section out and welding in a plate.
 
  
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Daniel
Donnington
Donnington


Joined: 02 Feb 2005
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2000 Porsche 996 GT3 Mk1

PostPosted: Mon Nov 05, 2007 1:24 pm    Post subject: Reply with quote

Seagull wrote:
It's important to catch it early otherwise it's a case of chopping the corroded section out and welding in a plate.


Looked at a 993 that had this done when looking for my first 911... Oh dear, it had been done not well !
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Jamie Summers
Österreich


Joined: 29 Oct 2002
Posts: 885
Location: Esher, Surrey

1992 Porsche 964 RS

PostPosted: Mon Nov 05, 2007 1:32 pm    Post subject: Reply with quote

Seems to be a complete lottery whether this affects you or not. I had to have my 45k mile RS (that has been garaged its entire life) repaired earlier this year, whereas my previous 160k mile C2 which lived outside in all weathers never suffered from this.

It is pretty common, and should not put you off a car per se, just worth getting it fixed sooner rather than later.

Jamie
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Robertb
Long Beach


Joined: 01 Sep 2003
Posts: 6529
Location: South Oxfordshire

2002 Porsche 996 Carrera 4S

PostPosted: Mon Nov 05, 2007 2:01 pm    Post subject: Reply with quote

Jamie Summers wrote:
Seems to be a complete lottery whether this affects you or not. I had to have my 45k mile RS (that has been garaged its entire life) repaired earlier this year, whereas my previous 160k mile C2 which lived outside in all weathers never suffered from this.

It is pretty common, and should not put you off a car per se, just worth getting it fixed sooner rather than later.

Jamie


it may also be a function of usage- track use/hard driving might involve a little more body stress than gentle road driving, hence weakening the joints/allowing water in.

Hard-driven F355s get corrosion on the rear buttresses in a similar scenario.
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Porsche
Brands Hatch
Brands Hatch


Joined: 31 Dec 2002
Posts: 13029
Location: Nürburgring Nordschleife

2003 Porsche 996 GT3 Mk2

PostPosted: Mon Nov 05, 2007 3:58 pm    Post subject: Reply with quote

Jamie Summers wrote:
Seems to be a complete lottery whether this affects you or not. I had to have my 45k mile RS (that has been garaged its entire life) repaired earlier this year, whereas my previous 160k mile C2 which lived outside in all weathers never suffered from this.

It is pretty common, and should not put you off a car per se, just worth getting it fixed sooner rather than later.

Jamie


Ditto to that, my old 993 suffered from this and got it fixed just in time under the Porsche 10 year rust guarantee
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needone
Newbie


Joined: 04 Nov 2007
Posts: 13



PostPosted: Thu Nov 15, 2007 10:53 pm    Post subject: Reply with quote

slight blisters on mine, planning to get the screen out and things cleaned up before it goes any further, those blisters can be like an iceberg, small on top and massive underneath!
 
  
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PolarExpress
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Joined: 03 Mar 2005
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2000 Porsche 996 GT3 Mk1

PostPosted: Thu Nov 15, 2007 10:59 pm    Post subject: Reply with quote

smtk wrote:
common fault, poor design by Porsche.


It appears to have been a fairly common design for windscreens to be installed at the time. Porsche weren't the only company of that era... BMWs of the same era suffer from exactly the same problem as they had the same design.
 
  
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needone
Newbie


Joined: 04 Nov 2007
Posts: 13



PostPosted: Fri Nov 16, 2007 1:10 am    Post subject: Reply with quote

what was the cause, no enough rust proofing or something to do with the drain channels or something different ?
 
  
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PolarExpress
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PostPosted: Fri Nov 16, 2007 1:18 am    Post subject: Reply with quote

One of 2 things depending on whether the glass had been removed before:

1) Abrasion between the seals and bodywork caused by movement of the glass, or

2) after a windscreen was removed by cutting the glass out with a cheesewire. The wire would score the bodywork to baremetal, and then when the new seal was put in, there was no protection reapplied to the metal.

In both cases water is trapped between the seal and bodywork and bingo... the water drained to the base of the pillar and just collected there without draining...
 
  
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smtk
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Joined: 23 Jul 2004
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PostPosted: Fri Nov 16, 2007 9:52 am    Post subject: Reply with quote

PolarExpress wrote:

In both cases water is trapped between the seal and bodywork and bingo... the water drained to the base of the pillar and just collected there without draining...


I couldn't believe it when i discovered all that water sitting under the seal then finding out there's no drainage for it :shock:

very poor design Mad
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needone
Newbie


Joined: 04 Nov 2007
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PostPosted: Fri Nov 16, 2007 10:54 pm    Post subject: Reply with quote

I'm suprised by the lack of design but then again I guess every design has its flaws.
 
  
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