AC Vent Temp Sensor

My heater has been blowing hot air at my face, cold air at my feet. All mode doors work. But sensor diagnostic 04 shows floor temp at 25 and vent temp at -45! I'm thinking this is why the system is pumping all heat out the vent.

Anyone know where the sensor is for vent temp, and what the probable cause is for it to read -45?

 

I believe there is a sensor in the dome/reading light vents, where the small fan is

 

-45 temp reading signifies you have an ambient air sensor fault.

Check behind nose panel ........ sometimes the sensor comes unplugged