last year the rear defrost keep blowing fuses then the reverse lights stopped working (not bulbs or fuse). this summer my AC/heater stopped working it is blowing fuses 5-10 muntues after the car is moving(changed the resister not it) and now the horn has stopped working haven't even bothered to check the fuse! can i assume its a wiring problem or is it something bigger?? any ideas??

Sounds like you have a set of wires shorted out. If you find one you might find them all.

I`d be looking around and in behind fuse panel . the big cluster of wiring and around kick panel. Do you have a kick ass sound system in it . look around that wiring if you do....lol