Kia sorento heater not working

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https://www.google.com/search?q=2004+kia+sorento+heater+core+replacement

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Make sure hose is on all the way. Make sure radiator isn't crack at upper hose connection. Good luck. Just start it and watch for leak as it gets warm.

You mean the brass or metal heater core outlet? If that is leaking and not the heater hose, you will need to replace the heater core. It is like a small radiator with coolant running through it. Find a repair manual for the kia to see the heater core replacement procedure. Some are easy, and some require removing the dash to replace the heater core- a pretty time consuming job.

You will want to taste the leak (or get someone else to do so) and make sure it is not water.
Antifreeze has a very sweet taste.
You should only need one drop, and be sure to rinse your mouth out really well afterwards.
Whenever a radiator is replaced, the hoses attached to it can also begin to leak, because the rubber hardens with age, and can be harder to seal again.
I prefer a stainless steel band clamp, not the original equipment.
A good flashlight would be a help as you look for the problem.
Be sure to check the heater hoses, and the other hoses that carry coolant, as any of them could be leaking, due to "being disturbed" or due to the possible higher pressure the new radiator is giving the cooling system.
Be blessed.

Kia tends to have rather poor heater control switches and motors. If your car has manual dials, then check any cables and fixings on the back of the control panel. These cables can come loose and fail to push and pull the armature on the heater matrix valve. If the car has an electronic climate control, then check the electric motor on the heater matrix valve as it may have failed.

There are fuses inside the car and under the hood. Check owners manual and investigate possible fuse blown. Ac,blower motor, dash, ac clutch, ac relay, blower relay. Always disconnect battery when working with anything electrical. Saves headaches

First, check your coolant if it's full, or has gone deplete because there been issue with the sorentos which kia doesn't acknowledge of a loose or leaking radiator plug which loose coolant. With low coolant, the heating system would not work since it's only sucking in air. 2) If that is not the case, then you maybe looking at a case of a plugged heater core, or thermostat being stuck open. The position of the air temperature valve in the air conditioning housing under the dash (which determines how much of the total airflow is permitted to pass through the heater) is stuck. The valve position determines the warmth of the overall air flow that is sent into the passenger compartment. This door-like valve redirects air flow. In some positions such as defrost the AC comes on to dehumidfy the air to aid in clearing the windows during high humidity. You may need to take a look behind the glove box compartment and dissemble the blower motor and clean around. It may work, if not you will need to get it to a shop as the heater core probraly bad or leaking.

I don't currently have access to step by step instructions for your Kia Sorento, but I would imagine that it takes a standard tool ratcheting tool set to unscrew the bolts for the shroud, and lift any fans out of the way. Then, the radiator hold down hardware can be removed and the radiator should be disconnected fromt he cooling system (via the hoses) and then you can pull it out. It does not weigh much.

Installation is the reverse of the removal.
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recalls for engine follow:

Gasoline Engines
2004 KIA SORENTO

03/01/2009 KIA REMANUFACTURED ENGINE PROGRAM 01/01/2004 CYLINDER BLOCK DAMAGE - HEAD GASKET LEAK - POOR RUNNING OR HARD START, EXCESSIVE WHITE SMOKE AND/OR COOLANT SMELL FROM EXHAUST, MISFIRE DTC - REVISED 06/01/2005 LOCKNUT RE-USE PROHIBITED 07/30/2007 CRANKSHAFT PULLEY BOLT REPLACEMENT

yes but if leak is from hose on back of motor they are sealed by an o-ring so thats all you need

could be one of the two radiator hoses. There are also two hoses in back that go to the heater core. All of these connections attach to plastic nozzles on the radiator and also the ones on the heater core are plastic and can crack. Also check radiator condensor for leaks.