what could be the cause of my 2003 sable ls' turn signals not working-flashers not working-cruise not working and blower motor not working?

have you checked all the fuses? there should be an under dash fuse panel, the brake lights and turn signals are without a doubt on that. your owners manual will give you a diagram telling you which fuse is what..blower motor would also be in there....if the problem keeps spreading and you constantly blow fuses, you have a major electrical short somewhere, maybe caused by moisture in an electrical connector or something to that effect

also check ur relays with tha amny things going on at once it may be those they are usually in a black box on the dirivers side under the hood you can take the cover off and u will see amll black sometimes white cubes check those.

Weird! My 2003 owners manual says blower and turn flasher are on different fuses. Same with the relays. Possibly a burned up fuse or relay socket(s)