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You should have a heater core in the rear. It is just like the one in the front, it should have water hoses going to the engine compartment, a blower with speed controls, and a mode door to switch from ac to heat.
 

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Ok, look at the controls for the rear heat, do you just have AC on the selectors?

Probably not, therefore, there should be a heater core.

When you can not switch between cold and hot, it is usually the blend door. This door moves the air flow thru the ac evap, or the heater core.

If the door does not move, the problem is usually an actuator (a stepper motor that moves the door), or a door that is jambed.
 

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No, no, you should be able to get at it by removing the inner trim panel. The one the big air vent is in (at least, that was the way to reach it on my Envoy).
 

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Haha, ok. The pics I looked at seemed to have one line cut off and a hole where the other line would have been. But hey, I'm just looking at a picture, I'll go by your observation.
 
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