Why would the horn only make a clicking sound on a 1997 Escort?

check your fuse. i had the same problem. that might be it. I doubt a fuse, the clicking is probably the horn relay that you hear. Fair chance the horn or connection at the horn is the problem. The clicking noise is the relay, and since it is clicking I doubt that your switch is bad, so check the fuse and also check the horn (hook it to the battery).