If you remove the dash top you should be able to see enough to identify leaks either because there are tell tale signs such as rust or by having someone wet all over the windscreen with a hose while you look inside for water ingress.
Compared to modern glued in windscreens, 504 windscreens tend to have sealing problems.
If you find that it's leaking this way then you may well have to remove the windscreen to check for rust as well as taking steps to seal it in properly. In the past, I've used one of the Sikaflex polyurethane products to completely seal it, although I can't remember which one.
Compared to modern glued in windscreens, 504 windscreens tend to have sealing problems.
If you find that it's leaking this way then you may well have to remove the windscreen to check for rust as well as taking steps to seal it in properly. In the past, I've used one of the Sikaflex polyurethane products to completely seal it, although I can't remember which one.