As far as I know, the horn is behind the driver's side headlight.
under the hood
driver front fender inside
2001 sl2. 119 exchanged NAPA auto parts
You clean or replace it.
Rear of the engine next to the firewall
1993 Saturn sl2
http://youtube.com/watch?v=ngcEWopvPBY
It depends on which solenoid you're talking about. For the fuel pump, horn, AC... remove the cover from the fuse/relay box then the relay just pulls out and is easily replaced.
You should be able to switch the relay with the horn relay and then check to see if the horn works.
Get a horn at Autozone or somethin, and look down behind the drivers side headlights. Positive negative and ground are on top.
You need coolant.
Check your coolant level