rear ac not cold

2001 expedition-need help front ac blows real cold but rear is a little cool. Checked vent door everything ok. air cond. line going in to aux. unit is ice cold. what can be wrong?
Terry

[quote=terob17]2001 expedition-need help front ac blows real cold but rear is a little cool. Checked vent door everything ok. air cond. line going in to aux. unit is ice cold. what can be wrong?
Terry

It sounds as if you'r expansion that feeds freon to you'r rear evaporator is not functioning properly. Stopped up prehapse.

could also be freon level I saw one with the exact symptoms you describe that was low