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You mean turn on heat but get Only cold air ? Is it front heater work and hot? If so. The heater hose to the rear core is plug. Need to flush it from both direction and make sure is full of coolant (Water). You should be good to go.
The large fuse you checked is for the rear fan blower motor. The fuse you need to check is for the fan motor relays and rear mode control motor. It is fuse No. 3 (7.5A) located in the driver's under dash kick panel fuse box.
If fuse No. 3 is blown and you replace the fuse and it blows immediately, you'll have to check the five relays and the mode control motor all located near the rear A/C unit in the right aft sidewall. Most likely, the mode control doors have become jammed and that is why the fuse blows. The doors shift air from overhead vents (cool) to floor vents (heat).
If the fuse is fine, the trouble is probably with the blower motor itself or the wiring to the blower motor is broken, or there is a bad ground.
It is probably the motor/actuator that controls the damper for air flow to the overhead or floor outlets (look on overhead console for button). Turn off the rear A/C and see if it stops. Switch between floor and overhead mode and see what it does. I just disconnected mine and now it only blows overhead. To disconnect just remove the tray on top of the passenger side rear panel over the rear A/C. There is a connector near the front that goes to the damper.
Have you checked the Aux switch near the bottom of the center control console. There should be a knob with: Aux, Off, 1, 2, 3. This is the switch for the rear AC blower. If the driver wants to control the rear AC, use the 1, 2, 3 settings. If you put it on Aux, Than the rear AC is controlled by the passenger in the back seat using the extra controls located on the Overhead DVD player. (The front AC must be on the rear to work)
Don't worry, it's designed that way. The owner's manual is pretty unclear about this. But the heated air only comes out the floor vents underneath the front seats and the "heat vents" at the forward and side of the rear A/C compartment near the floor. The cooled or vent air flows from the overhead vents.