The heater dose not working in kia sorento 2006

Check the coolant level.

Mate does the heater blow cool air, if you haven't had your car for long and never used the heater maybe one of your heater hoses blew on the previous owner and he's disconnected heater hoses by running one hose from one part of the motor to the other part of the motor bypassing the heater... I'm only guessing as I did the same thing with an old car I use to have...... Hope I helped.

Sounds like the cooling system is low on antifreeze. Have you checked to make sure it is at it's proper level?

1. the hot/cold switch on the dash has become disconnected. (if the swich has suddenly become easier to operate this is the problem) reattach.

2. the heater tap/hoses are blocked/broken/unattached... (do the heater lines under the bonnet get hot? (two rubber hoses about 1/2 to 3/4 inch thick that run fron the engine to the firewall/cab.
repair/replace.

Engines can rock on the motor mounts. You probably have a vacuum line that is pinched, cracked, broken,kinked, or unhooked. check the engine compartment lines first. If you have thin plastic vacuum lines, they can kink more easily than rubber lines. If you have been working under the dash (replacing a radio, etc) check your work area in case you have a broken fitting on a vacuum housing or an unhooked line.

check your heater controls , there may be a cable lose or broken, or a vacume hose lose or broken,i don't know if that car has a heat control valve,but if it does you might check that as well.
hope this helps!

I would change thermostat and see if that fixes the problem

does the blower motor turn on. if so then check the heater core lines going into the fire wall when the vehicle is wam and feel if both are the same temp if they arent u may have a plug in the heater core preventing it from circulating thus no heat.

possible air door problem. those have a 100k warrany right? take it to your favorite dealer.

I have a 2007 Kia Sorento EX. I had a similar problem. I checked for leakage in the nozzle. The nozzle was repaired and I refilled gas. This resolved the cooling problem.