Question about 2004 Kia Sedona

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No heat I have a 2003 Kia Sedona with no heat , I have replaced the thermastat but still no hot air. The fan works well. It also looses coolant slowly, but no leak seen.

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Check the heater hoses going into the firewall when hot they should both be warm one more so than the other. if they are cool you do not have coolant geting to the heater core thermostat is wrong or backwards. I asume you replaced the stat due to this problem so your hoses are probably hot. If there is a big differance the heater core may be plugged. flush it from the cooler of the two hoses with a garden hose out the side of the hotter hose. DO not do this while it is hot! If the hoses are close in temp you have a blend door control issue. It may be the actuator on the heater box or the controller on the dash. Good Luck

Posted on Mar 02, 2009


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Posted on Jan 02, 2017


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If both heater hoses are getting hot and the radiator is full of coolant, you may have a problem with one of the blend doors under the dash.
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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.

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I have a 2003 KIA Sedona and it is overheating after about 5 minutes of driving. Coolant reserve levels are normal and I checked the radiator and it appears to be full. Any idea as to what the problem...

If you are not losing coolant the first things to check are if the fan(s) are engaging and if the thermostat is opening. Start the engine cold and monitor the temperature as it warms up. As it starts to get hot, Gently and carefully grab the upper radiator hose. If it is cool to the touch but the engine is hotter than normal the thermostat is stuck closed and needs to be replaced. At the same time listen and watch for the cooling fan to engage. You should have 2 electric cooling fans. One works off of coolant temperature and the other off of accessory load. Turn on the a/c during this test with the temperature setting on hot. This way you can see if the fan is working while you check the thermostat operation and the fan will engage and help cool the engine if it is operating properly. Feel the hose for breaks in the coolant flow, if the thermostat opens, to detect if air pockets are present in the system. if you have never opened up the cooling system for repair, there should not be any air in the coolant.

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Our Sedona had a similar problem, Turned out that the pipes to the rear heater had corroded and were leaking, caused some overheating which blew hot air when the A/C was on. I would check this then check the coolant pressure.

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3 Answers

2003 kia sedona over heating and no heat

Check your rear coolant lines, These lines always rust and start leaking coolant and thats why your engine over heats and you dont get any heat inside your car. This is a common problem with kia sedona that have rear A/C and Heater. There are two fixes to this problem. The first is to replace the rear heater coolant lines with the updated lines from kia. The second will be bypassing the rear coolant lines with a hose, however the rear heater will not work with this method.

removing the rear coolant lines is not that easy. The lines near the fire wall are really hard to remove. Its also much easier to replace the lines with the car on a hoist.
hope that helpfull

Kia mechanic

Dec 29, 2008 | 2003 Kia Sedona

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