The heater will stop getting hot when you're low on coolant. If the coolant is low enough the engine will overheat and it will be severely damaged.
a vac leak
Start with replacing the fuel filter, it may be plugged up. If the stalling persists, have the fuel pump psi tested.
I had a 1987 Chevy Celebrity that would start and then immediately die. It turned out to be bad fuel injectors. I replaced three fuel injectors and the problem has not returned.
Maybe a throttle positioning sensor? Is it hard to start? Does it start then stall?
If the oil is low in your car, it can eventually cause your car to stall and not start. It can also kill your engine.
Start with replacing the fuel filter, it may be plugged.
AC runs on the battery. If the car is off and you run the AC, then start the car, it will stall.
No. A bad starter would cause the car not to start.
A fuel pump relay switch can cause your car to stall after starting. A malfunctioning fuel pump relay switch can cause your car to not start at all.
Cause Kias are Sh't cars
Start and stall out, possibly. Not start at all, not likely.
If i were you i would start with the catyletic converter ,it'll start cold,start for a minute then stall, start back up but wont drive ,idle, but not drive ,check it out.