The first response, of course, is "take it to the dealer". There are
even a couple Technical Service Bulletins dealers have access to that
look like they might address the issue:
99-2-3 FEB 99 Windshield - Water Leaks
97-24-1 NOV 97 Convertible Top - Leaks In Rain And/Or Car
Wash
The full content of these bulletins are available online from
http://www.alldata.com , but require a $24.95/year subscription. This
price does include full access to all the Technical Service Bulletins
and Recalls for your car, so if there are a couple issues you're
interested in, it might be worth the subscription price.
You might be more interested in the experiences of other owners who
have had the same problem. The message boards at
http://forums.stangnet.com , for example, can be an invaluable
resource for learning about and working on your car. Here's a thread
relevant to the windshield leak:
"89 Vert - Leaky top?":
http://forums.stangnet.com/showthread.php?s=e4fb4c7443b9353af4b96787ad7df62a&threadid=158741&highlight=convertible+leak
The gist of this thread yields an attack plan:
1) Tighten the hooks. (already tried)
2) Thoroughly clean the weatherstripping (rubber seal) between the
windshield and top. See this page for cleaning tips:
http://www.metrommp.com/src/instguid.htm
3) Replace the weatherstripping. Even though it may appear to be in
great condition, it may be deformed or degraded in such a way as to no
longer provide an adequate seal. (The above page about cleaning
describes the problem: plasticizers evaporating over time, which
causes the rubber to harden.)
Here's an online source for Mustang weatherstripping:
http://www.metropartsmarket.com/catalogs/latemodelmustangparts-c6s2.html
I believe that if the leak is between the windshield and top, you
would need the "94-99 CONV TOP WINDSHIELD WEATHERSTRIP", $125. You
might want to use the email link on that page to ask if that's the
part you need, since there isn't any further information on that part.
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