Push on the horn and I here a ckicking under the glove box but the horn does not work

In the fuse box under the hood or in a box behind glove box.

check the fusebox under your hood for the horn relay,should be a black box close to your battery that has fuses in it

http://www.autozone.com/autozone/parts/Duralast-Relay-Horn/1996-GMC-Sonoma-2WD/_/N-j5qmvZ9cj6u?itemIdentifier=155154_0_0_ The horn relay is located Front seating area, passenger side, under dash, mounted on support bracket under glove compartment.Click on link to see relay.

The first thing is to check the fuse and if thats sokay then check the horns they may be bad, if you use a testlight and have someone push on the horn button and see if theres power to it, if theres power then the horns are bad if theres no power and the fuse is good then you may have a bad horn relay or a problem with the horn buttons or a wire in the steering column,okay lets start with the fuse location, the fuse box is located on the leftside of the dash behind the trim panel, i have enclosed the fuse box diagram and circled the horn fuse which is in location #14 and is a 20amp fuse, take note that the horn fuse is the same as the lighter and glovebox light and power antenna, so if those things are working its not the fuse but you can check it anyway,the horn relay is located on the pass/side of the dash to the right of the glove box under the dash,there you will see a relay box with alot of relays, the horn relay is slot # 2, i enclosed a diagram of its location and the relay spot, hope this is helpful .goodluck.

The fuse box is behind the glove box. You might have to pull the glove box past the stops to access the fuses. The 15 amp horn fuse should be there. There is also a horn relay, which is usually located in the engine compartment relay box. Please see my tip if you want to check the relay socket: http://www.fixya.com/cars/r6022358-relay_check

there are two fuse boxes on most vehicles, one under the hood, and one in the car near the driver area or glove box. the horn fuse is usually in the car not under the hood

It is the horn relay. It the horn is not working either the wiring is disconnected or corroded or the horn is bad.

fuse box should be under dash drivers side possibly some fuses behind a panel in the glove box and possibly under the hood

MOST LIKELY THE CLOCK SPRING ROTATING CONTACT UNDER THE STEERING WHEEL IS DEFECTIVE/OPEN.

From page 130 of my UK spec Focus manual (Right-hand drive): -

Central fuse box is located on the left hand side underneath the instrument panel .
Open the glove compartment. Push in both sides of the glove compartment and swivel it down completely.
The fuses are behind.

The horn and power seats are on fuse number 33, coloured yellow and rated at 20 Amps.