Some posts have mentioned a small rod that can be seen under the dash on the passenger side. For the 2002 Spectra, this rod controls the temperature. The rod that controls which vent the air comes out of, is under the dash on the drivers side near the control knobs. If it is hanging loose, reconnecting it will almost certainly correct the problem. The air flow may also be controlled by a small motor behind the dash. The part is not cheap and your local Kia dealer will probably charge a chunk for the labor. Most of the dash has to be removed to get the assembly out, requiring the removal of a number of screws and careful prying. If you want to try the repair by yourself, befriend a local Kia mechanic and ask for instructions or go to your local library and see if they have a repair book that covers your car. Worse comes to worse, you can buy the manual online. If you have any intention of keeping the car for a while, the book will be a good investment because you will need it often.
a control is a object that cant be changed in an experiment and a variable is a object that can be changed in a expirament
with a push button directly under the defroster control
Check your servos.
Yes, septic tanks typically have vents to allow for proper ventilation and odor control.
it won't stay on if your blowing it the floor or using defroster.
Try improving ventilation
open
pressure control
Rising CO2 levels.
Need more detail, make and model and year would help.
If the defroster is on, so is the AC.
Turn the defroster on. If you have a separate AC switch, turn it on also. The AC should come on with the defroster automatically, but might not. If no AC, set the vent control to outside air instead of recirculate.