I have a 1998 cavalier and had the blower motor replaced thinkingvit would make the rear defrost work but it didnt. Ive checked the fuses what else could it be?? Please its freezing and cold outside! It doesn't have a button for the back!

 

there could be a break in the circuit going through the rear window. you have to look over the circuit and try to find the issue. theres kits sold at most parts stores to repair the circuit