Hey there--just joined this forum looking for some advice on my '97 sunfire too! Looks like you've figured out a fix for the fuse, but if anyone else has that happen, I had the same problem. I figured out that the fuse would only blow when the cigarette lighter was actually pushed in. I tried it myself--blew the horn while pushing in the lighter and poof--no more horn. Needless to say, I bought my last fuse (of many) that day and have never used the lighter again. I have not tried other accessories in the outlet, so I don't know if it's just the lighter or if it would happen with anything you plug in.
Good luck with your car! I bought mine new, and it now has 130,000 miles on it. Just starting to have some not so small *issues* with it, but seeing the way I've treated it over the years, I can't complain.
