The most likley cause is a break in the electrical pathways of the defroster. The lines you see on your window are actually conductive lines of material designed to carry the current across your glass causing it to heat and subsequently defrost your window. The most common problem is a break in one of those lines. Check all fuses. The fix is to go to your local auto parts chain ad buy some conductive defroster touch up paint.
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The rear defrost is an electric switch for the defroster in the rear glass. If you turn on the ac and do not get cold air, the first thing to check is if the compressor is running. If not, you could be low on freon or have an electrical problem in the circuit for the ac clutch. If the compressor is running and one of the ac lines is ice cold, you could have a blend door problem under the dash.
You definatly have water inside the car. Pull the carpet back in the front and rear checking for water leaks. The only way frost can develope inside a vehicle is the presents of moisture. The other possibility is your HVAC drain is plugged and water has built up inside the heater motor area. Have the drain checked and cleaned.
rear defrosters are an apllied film of semi metalic strips and if you get you windows tinted often the tint man accidentally nicks these strips cuasing the defroster to malfuction check for breaks in the srips
Disconnect the cable that goes to the defroster at the rear windshield, this will allow you to put the fuse back for now. Check or replace the rear defroster switch. If its not the switch you have a short-circuit. You can try replacing the wires from the switch to the back windshield, you can use the same switch or an after market one will do.