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the cab heater fan?, there can be 4 fans on some cars. front condenser, 2 on rad, and 1 in cab heater box. the cab fan? does it fail on high too? it has a switch, (marked fan speed) the switch is bad ,if low speed are dead. and high are good. or wiring to it , the motor or the fuse. even a cracked fuse, change the fan fuse to a new fuse.
if engine at long stand still,the engine temperature will rise about 190 degrees the cooling fan suppose to automaticaly turn on when coolant temperature sensor get hot it cause its resistance decrease causing pcm to send power to coolant fan relays and cooling fans, when you turn on AC the cooling fans suppose to turn on to cool down AC CONDENSOR, IF NOT AC WONT WORK COOLING FAN COOLS DOWN REFRIGERANT SO IT CAN RECYCLE THROUGH THE SYSTEM AGAIN.your cooling is suppose to turn on when engine at a sit still if vechicle not moving as coolant temperature rises at a set point the cooling fans will turn on cool down engine.cooling fans dont turn on when you first cold stsrt vechicle unless you have AC SWITCH ON.if cooling fans dont turn on when vechicle at a long stand still or moving along slow traffic.if coolant temperature sensor been replaced and fuses and relays okay have dealership check see if pcm driver circuit working faulty pcm will cause cooling fans not to turn on.
just a guess but being that the rear defrost is not woking id bet ist a fuse check owners manuel or go to a local autozone or the like store as thy should check this for free hope this is helpfull.
please post response good luck