Air conditioning system reset on 2005 Scion tC

Last year my AC system stopped working, I got it back to full with freon because it ran a little low. After filling it the AC system still didn't work and someone told me you have to reset the system. its some for reset switch. any chance anyone know where this is.

Asked by for the 2005 Scion tC
If you have air in the system it will not work correctly. You'll need to get another ac service where the remove the 134a, and vacuum the system fro 30minutes, then reinstall the 134. If still a no go(compressor wont turn on) then there is a problem with one of the sensors.