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Most GM cars and trucks use the fuse panel for safety with the rear defroster...Check your owners manual for the location of the fuse block...I think it is inside your glove box...Try the fuse first...if not the fuse...your options include replacing the glass inserted strips...(do not remove) with a rear shelf defroster blower motor... or an add on rear window defroster...Your auto parts stores should have both...Hope this helps.
Check the fuse it should be labeled in the fuse panel as rear def. If its blown replace it and if that doesnt fix it or if the fuse blows again then u have an electrical problem and will need to have a technician look at it.
blinkers sounds like the flasher unit is not working. It's located under dash. Also check for burnt out bulbs.
Rear defrost, or rear defogger?: Your defogger for the rear window would run off a relay, probably located in the fuse panel of your car. Often, the connections at the rear window get broke or disconnected.
Front defrost: does your heater blower work?
check that the antenna cable is still plugged into the back of the radio and plugged into the bottom of the antenna at the finder to check radio end insert 4 large paper clips into the square holes in the front corners of the stereo this disengages the lock mechanisms slide the radio out and check the connections if electrical antenna check the fuse on the back of the radio that it isn't blown if so replace. loosen the inner fender panel and see if cable still connected to antenna #2 check the fuse for the rear defroster its probably blown if so replace and check for any grounded out hot wires also check the connections at each end of the rear window sometimes they become corroded or unglued from the window, if any of the fine lines that cross the window have been scratched or removed partially this will also render the defroster inoperable
check fuses and the relays and also check the electrodes on each side of the glass of the back window that they are not unplugged and if no owners manual then stop by a dealership in the parts department and they will tell you where the location is for the fuses and or relays that maybe involved with the rear window because there is fuses under the dash on the drivers side as well as fuses and relays under the hood on the drivers side