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Hi my name is Robert....
IF it is the rear AC and the thermostat runs both front and back it sounds like a problem with the thermistor or sensor that senses the temp for that zone, the sensor will be on a cabinet, and many will have a small slotted plastic cover the thermistor plugs into the control box for the AC unit. So if the thermostat is reading 32 then I suspect the thermistor is bad OR the control box inside # ***** AC unit.
On some thermostats you need to do a reset, not sure if you tried that or not. In oreder to help you further on this I would need the make and model of the thermostat AND roof AC unit. Robert
Hi was just checking in to see if my answer helped? IF you have more questions or concerns please feel free to contact me... Robert