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Re: air in cooling system
Make sure the engine is cold and and remove the radiator cap. Top off the radiator and coolant recovery tank. Put the cap on the recovery tank but leave the radiator cap off. Start the engine. Monitor the temp. gauge about every 20 seconds. Carefully grab the upper radiator hose in 90 second intervals and very gently squeeze it a few times to help release the trapped air.The coolant level should drop visibly into the radiator as the thermostat opens. Now bring the rpm up to about 1800 and HOLD it there while you top off the system and then tighten down the radiator cap completely before you drop the engine rpm. I recommend using a friend to help with this procedure. Then let the car run as you check for the upper hose to feel warm and solid to the touch. Watch the gauge. The reading should be steady. If it starts to overheat, shut off the engine and wait for it to cool down. Repeat the procedure if necessary
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If you have emptied the cooling system and refilled it, you need to bleed air out of the system using the correct procedure for your engine.
If you did not bleed air out after refilling, you will have air trapped in the cooling system and it will not function properly. You will most likely get an overheating condition.
As you were not specific as to which part of the 2004 Kia Sedona air conditioning system you were referring to I included a link from which I obtained the below diagrams. I hope I included something that may be helpful.
The brown sludge you're seeing is the result of GM/dealers/repair shops installing cooling system sealer tabs in the cooling system. This sludge is NOT related to the use of dex-cool coolant. The cooling system sealer tabs are brown in color, and resemble dirt after they are crushed and poured into the cooling system, and pretty much turn into nasty brown mud in the cooling system. I have seen this on many vehicles. The problem you are having with your heater is most likely related to the sludge you are also seeing in the radiator. The sealer finds its way into the heater core and plugs it up, resulting in cool air instead of hot air. The best way to clean it out is to remove the heater hoses from the heater core and back flush the heater core with a garden hose. You will see a lot of nasty brown junk come out of the heater core when you do this. I have found that cooling flushes that dealers and independent shops sell are not effective at completely removing this sealer, and may have to be done multiple years in a row to get most of it out. Even then, there may still be sealer lodged in the system. Your description of the heating and air system defaulting to the defrost and floor positions tells me that there may be a vacuum leak in the vacuum supply hose between the engine and the interior control (HVAC Programmer, if I recall correctly). The default position is defrost when the system loses vacuum. You may want to have your local shop check that and make sure you're getting vacuum to the HVAC controls.
Theres a strong possibility being you just changed the coolant a few weeks ago that theres air in the cooling system not allowing the coolant to cirrculate properly, look at your top radiator hose is theres a small bleed valve at the top of the thermostat housing when the upper hose attactes to? If so loosen the bleed valve and allow the cooling system to purge the air out of the system you can tell when the air is out of the system when a steady stream of coolant starts to flow out of the bleed valve, if theres no bleed valve take the top radiator hose off of the engine side and allow the cooling system to purge the air out through the top of the engine that way, but it definatly sounds like theres air in the system not allowing for the cooling system to cool properly...
If this model is what i think it is, look at the thermostat housing. There is an allen screw bleeder. With the engine cool, loosen this screw. allow the engine to slightly warm up. Very carefully loosen the screw and start bleeding excess air. You will need to do this for about 5-10 minutes. Whats going on is air is trapped in the cooling system (Vapor Locked). Get all the air out and your fixed.