windshield pitting

[Phil Rose <pjrose@servtech.com>]

Seeing Mark's question reminds me of a concern about windshield pitting
that I've had for a while. I don't know what Mark's driving conditions are,
but I've noticed significant amounts of small-sized pitting on the
windshield of my '89 100 (104K miles) and somewhat less on my late '91 200q
(95K miles). It's the sort of pitting (very tiny specks) that is obvious
only under certain (bright frontal sunlight) conditions. The '89 100 has
spent its life in central NY, while the '91 200 was driven mainly in the
Chicago area.

I wondered if Audi glass more susceptible to this than others? However,
once I had noticed this on my Audis, I looked carefully at the glass on our
'96 Explorer (20K miles) and I could see a bit of the same sort of pitting
there as well.

What causes this--assuming we don't live in sandstorm areas of the world?
Bugs? Road salt? Acid rain? Speeds in excess of ??? mph?

Phil Rose


>Date: Wed, 28 Jan 1998 21:29 -0500 (EST)
>From: Mark Pollan <Mark.POLLAN@mci.com>
>Subject: Removing Windshield
>
>Hi all:
>
>I've decided to replace my windshield that is pitted from at least
>175K miles of use.  I believe it was replaced before based on the way
>the adhesive is gobbed in some places and the rust on the inside of
>the pillar.  Theory that when replacing the windshield some monkeys
>scratched through the galvanization.
>
>Anyway, I want to pull the window myself, fix the rust spots and have
>a glass shop put a new one in.  Ant BTDTs on removing the windshield
>_without_ special VW tool XXXX?
>
>TIA,
>
>Mark Pollan, '86 5KCSTQ 245K Miles of which 175K are mine.

Phil Rose		Rochester, NY
'89 100			pjrose@servtech.com