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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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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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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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

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