Dear Helen,
Here is the scoop on most cars.
The horn itself is mounted somewhere in the front of the car, often near the radiator.
( Not usually inside the wheel well, as inside the wheel well it could be ruined by splashing water from the wheel.)
Sometimes in front of the radiator, sometimes behind.
There is also a horn relay , usually under the hood somewhere.
Your car could have a problem anywhere in the circuit.
If I were fixing it, I would first take a "hot" wire directly to the horn itself, to see if it were still good.
God bless your efforts.
The horn/s are located on front cross-member.
Note the horn wiring diagram. The horn relay should be located in under hood fuse box, remove the relay, use jumper wire between terminal 30 and 87, the horn should sound. If it does, problem on control side of relay/coil in the picture. Usually the problem is the horn button--wiring in steering column, maybe the clock spring? Terminal 30 is hot/voltage all the time. Use a test lite to check voltage. At the proper fuse, not only check the fuse, check voltage at the fuse circuit.
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