97 taurus wagon

My 97 taurus wagon has a water leak on passenger side against firewall, that only leaks when we have wind-driven rain. I thought it was windshield, but that's sealed OK. I read something about a cracked cowling, but I can't find the article again. The previous owner probably got rid of it for this reason, because I noticed it had a funky smell when we got it, but the leak didn't show up until 3 or 4 months later.