There is usually a relay that the thermostat controls , look in the fuse
compartment under the hood , on the underside of the fuse  cover it should
list the fuses and relays , see if the numbers on the a/c relay are the same
as any other, if so swap them around and see what happens.
The relay may be stuck in the on position .   I'm telling you this based on
experience from other cars  not Kias and an amateur .

Hello;
there is a thermistor or thermostatic switch in the evaporator housing, the
capillary tube is pushed between the fins. Don't overlook the basics,
pressures ect.
C'ya!
mike