Question about 2003 Kia Sedona

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2003 kia sedona over heating and no heat

Temp gauge is reading hot however there isnt the typical steam coming from the engine when it says it is overheating.. and there is no heat coming from heater , blower works

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  • daltoncorp Dec 29, 2008

    where is the best place to find diagram of how to replace it?

  • nicoleachris Jan 16, 2009

    I have the same problem buts its not the thermostat... dont know what to do??

  • callen018 Feb 03, 2009

    Same problem here on a 2005 Kia Sedona. Temp was running hot, so I checked the engine coolant which was VERY low. Added some, seemed to be ok, but now I'm not getting any heat. Only feels luke warm when I'm driving. As soon as I stop, I get cold air. It's only like 10 degrees outside and my fan is kicking on to keep the engine cool...and temp gauge was just a little tiny bit over the mid way point where it's supposed to be, so it seems that it's still overheating. Looking for a fix...hoping it was thermostat, but according to you guys, it's not. Waiting now for brother in law to call, as he's a mechanic.

  • WhyKia Mar 05, 2009

    I have an '02 Sedona with the same issues. Heater has been blowing cold air for awhile, and now the temp guage just about went to the top. One earlier answer said to replace the thermostat, but another said that's not it? What's the right answer?

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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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Posted on Feb 02, 2010

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I would try replacing your thermostat. this should fix both problems

Posted on Dec 29, 2008

  • toney clark Dec 30, 2008

    your local auto parts store will have a haynes manual and those have pictures and step by step directions

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You have an air gap, keep filling the rad while the car is running you need to get the air out, fill up the rad and it will bubble and lower keep doing it until it stops, the its full

Posted on Jan 09, 2011

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OOPS ,big mistake ,did you turn engine over with a rachet first to make sure valves cleared pistons

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1 Answer

2003 kia sedona over heating and no heat


This Problem is Usually Caused by a Malfuntioning Thermostat. Change the Thermostat and let me know what you get. Please Rate My Solution, I Need all the Help That I can get! Thanks!

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