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993 C2 coupe (1996) : rust around base of windscreen/'A' pillars

AJOHND

AJOHND

PCGB Member
Member

My understanding is that this can be a common issue for this model of Porsche - caused I think, by water seeping down the inside of the external windscreen rubber surround and collecting at the base of the A pillar.

I have just had such corrective work undertaken by a porsche-approved bodyshop (windscreen out and new rubbers fitted; along with several 'hold your breath' moments along the way!) but it appears that water is still flowing down the inside of the rubber surround (on the outside of the car). Surely this will - over time - create the same problem as I've tried to fix? Should not the new surround be 'watertight'?

Does any Forum reader/contributor have experience of such issues and any similar work being undertaken; specifically in relation to the watertightedness of the external rubber surround? Is there a recommended 'fix'?

Many thanks,

John Dymond

PS : as far as I can tell there is no water ingress inside the cabin of the car
 
Yeah I had the work done to my 993, early last year by Bob at RGA in Vauxhall, London. Haven't had any issues since, and he put the clear "tape" under the Window Seal to prevent the troublesome buzz..

I would say that the water should not be running down the inside of the Rubber Seal..? Have you had a chat with the place that did it..? Did you go via an OPC..?
 
Are you aware of the Porsche technical note which suggests filing the gap between the window and the body before refitting the outer rubber ? Did this myself.. very easy. I've got a copy of the note somewhere and will post to this forum.
 
The water will always get in behind the rubber. As we rarely drive these in the rain it's not an issue. Its usually after cleaning(even without using a hose), so always lift the rubber in the corners to release the water.

Remember you have a lifetime warranty if you take it back every year for inspection. Filling it in with silicone will invalidate the warranty and if not done perfectly all the way round can cause bigger problems.
 
I think Gordon was using the royal "we” there ?? Mine certainly gets used rain or shine and even in the snow with winter tyres
 
Many thanks to those who replied to my earlier question; it is interesting that folks to whom I've chatted (Forum, OPC, bodyshop undertaking the corrosion eradication work, 993 owners etc) are split pretty much 50/50 as to whether the external windscreen rubber should act as a 'watertight seal' or simply as a 'cover'. Personally I'm in the former camp, as - having had the corrosion removed (and in the knowledge that water will still gather behind the rubber) - it doesn't seem right that in a few years time I will probably have to go through the same exercise.

John
 
The rubber seal is not watertight. You can peel the inner and out edge back with your finger so whilst they keep the majority out they don't keep it all out.

You either have to fill the gap with the mastic on the technical note or rely on the paint coat for protection. It is a known design quirk of the 993 and every other 911 that came before.

Ian.
 
I have had my screen replaced, very minor rust sorted, resprayed and all new seals. I wondered whether the filler seal from Type 911 had any effect on closing the gap allowing less water to settle? I have an annoying rattle in my dashboard which is another subject altogether but I had it pre and post screen so reckon something is loose. Someone I spoke to about water ingress, rust and windscreen creak said they lift the seal and squirt a light oil into the channel every few years.

https://type911shop.co.uk...f2206766/Products/7233
 
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