How do you change the tempature reading for the air conditioner from Celsius to Farenheit?

Read your owners manual about making the change under the time setting

On the Luxpro PSD111, Farenheit or Celcius are selected using the Jumper Switch J2 on the rear of the unit's circuit board:
Open = Celcius
Closed = Farenheit

To shift from Fahrenheit to Celsius on Your KIA Rio, press the OFF button and the AUTO button together for at least four seconds. Now, the display will change from Fahrenheit to Celsius or the other way around.
Also, if you disconnect the battery and let it breathe for a while before reconnecting, the display will go to the original form, i.e., Centigrade or Celsius.
To know more about your KIA RIO, please refer to this owner's manual https://www.manualslib.com/manual/740114/Kia-Rio.html?page=195

found this

Read more: How to Change Ford Focus Temperature Display to Celsius ' eHow.com http://www.ehow.com/how_5989096_change-focus-temperature-display-celsius.html#ixzz2Nd8mOf00

Scroll through the digital display used to display trip distance, until it displays the outdoor air temperature.
Read more: How to Change Ford Focus Temperature Display to Celsius ' eHow.com http://www.ehow.com/how_5989096_change-focus-temperature-display-celsius.html#ixzz2Nd8mOf00

Press the Temp UP and DOWN buttons at the same time and hold for about 3 seconds to toggle between Celsius and Fahrenheit measurements.

the most likely cause is the dual control valve in the cooling system and/or the wiring to it. you can change the settings back to the origional settings using the touch screen or the dash switches . @ your model/year there was a factory fix which was about changing the servo motors on the climate control unit for that problem.you may need to take to a jag dealer. but first make sure the outside temp is reading ok on the dispay that can also cause that prob if its gone faulty

To change the temperature reading from C to F (or vice versa), press and hold the recirculation button, then press the off button holding the switch down for 3 seconds or more until an audible beep is emitted. If the battery is disconnected and then reconnected, the temperature reading will revert to C. Turning the ignition on/off will not change the customer's set preference.
(See http://www.discotech.info/index.php?title=Climate_Control for more customer configuration options for the climate control)

the temp display can be switched between celsius and farenheit readings, since the car is from europe the default is celsius, The manual has instructions on changing back, You have to hold 2 buttons on the display per the manual.

via the system tester me thinks but i'm sure it can be done via the dasboard look in the handbook think it might say in there