Question about 2003 Kia Optima

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2003 kia optima over heating

2003 kia optima is overheating. Changed tyhermostat. Now there is no water in the lower radiator hose after running it. Could it be a clogged radiator? I have never seen a thermostat that is in the lower hose??? Which direction does the water flow?

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  • Terry Barilleaux Apr 29, 2013

    Need diagram for 2006 lower hose

  • Anonymous Mar 23, 2014

    how to change lower hose on 2003 avalon

  • Anonymous Mar 31, 2014

    hi my kia is over heating the water is bubling in the bottle in the front and i have just changed the head and gasket and radiator and water pump

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Out from bottom to top

Posted on Nov 15, 2008

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I have a 2003 kia optima and evry cple weeks it overheats,ive checked the oil for signs of water and there are none and cannot find any signs of leaks anywhere from the coolant


Have you changed the termostat in it, Or are you shure the water pump is working (Properly) You should not leave a problem like that unatended so long It can do serious (Damage) to the engine, Like cause it to seaze up.

Nov 03, 2012 | 2003 Kia Optima

2 Answers

1988 b2200 is overheating--we've changed out the lower radiator hose, thermostat, and the upper hose is fine. Why is it overheating? Radiator, heat pump, or water pump?


!st check and make sure the water is flowing in the radiator, then check
the timeing, Mazda will run hot if the timeing is rong.

Jul 19, 2012 | 1988 Mazda B2200

1 Answer

Adjust radiator cooling fan 2003 kia optima


There is no adjustment on the cooling fan. If the car overheats, there are only a few things it could be. First, with the engine off and cool, check if the radiator is full of coolant and it looks clean.

The most likely cause of overheating is a stuck thermostat. You will need to drain the coolant and replace the thermostat. You can locate it easily by following the top radiator hose to the housing on the engine. The thermostat is under this housing.

You could also have some kind of blockage on your radiator. If there is a lot of dirt in the fins, air cannot circulate and remove the heat. Use some compressed air to blow the fins clean.

Apr 25, 2012 | 2003 Kia Optima

1 Answer

2006 kia optima overheating, no apparent leaks, top radiator hose gets hot lower never heats up, fans dont come on


I would be looking at the radiator fans themselves, especially if the fans are open
framed motors. I had the same problem with an intermittent fan on a PT cruiser,
If your A/C doesn't seem to be working right at stop lights then the fans are
most likely not operating correctly since they assist the condensing coil when idling.
Second thing I would suspect is a thermostat which is stuck closed. (This will cause overheat).
Hope this is helpful.

Jul 31, 2011 | 2006 Kia Optima

1 Answer

2006 kia optima is overheating. I turn the heat on and the temp guage drops. No visible hose leaks, but there are telltale antifreeze spray stains on lower radiator hose. Do I need a thermostat or could it...


Hello, donartias888 and thank you for asking your question on Fixya!

Here is a simple process that will walk you through a few steps that will pinpoint the overheating problem on your
2006 Kia Optima, without even using any tools. It has helped millions of people, and I am certain that it will help you, because I wrote it for people in your exact situation.
How to diagnose your overheating
2006 Kia Optima

Get more great money saving tips and tricks about your vehicle from: twitter.com/acoates23234

Thanks for the vote, and good luck!

Nov 11, 2010 | 2006 Kia Optima

1 Answer

How to replace the thermostat


Take the two bolt out of the water outlet for the lower radiator hose. Pull the thermostat out and install new one. If it has a bleed valve make sure it is pointed up to the twelve o clock position. Reinstall bolts (2) for the lower outlet and lower hose and fill the coolant. Run engine with radiator cap off for ten minutes or so until the fan kicks in and you have good heat coming out of the dash.

Oct 06, 2010 | 2004 Kia Optima

1 Answer

Kia optima 2003 has an overheating problem, no water is leaking out and the breaks are locking up when it get hot


This is very vague and hard to diagnose without more detail. I have a hunch the the brakes "locking up" is a different problem than the engine overheating. To check the engine: Remove the radiator cap from the cold radiator. Be sure the radiator in almost topped off with 50/50 antifreeze & water. Start the car and let it idle until either you can turbulence in the radiator, or the engine is getting really hot. Is the water temp gauge working? You can keep an eye on it during the process. If you see turbulence then the thermostat is opening, and the water pump is pumping. The thermostat is fairly easy to replace. The water pump is lots of work. Usually the timing belt, tentioner, pulley, and accessory belt is changed at the same time as the water pump, because the labor costs more than the parts. Hopefully nobody ever put straight water into the radiator. It causes corrosion, and lots of related problems.

Dec 16, 2009 | 2001 Kia Optima

1 Answer

Kia optima overheating, changed thermostat, heat sensor, and ran grounding wires... help


Hi,
New thermostat is a good move. I don't know if your radiator is clogged, it's such a late model... but it's still a possiblility.
I would want to know if the water pump is working properly.
Sometimes with the engine COLD, I would remove the radiator cap and crank only for a moment or two... enough only to visually "see" inside the radiator, if there was some coolant "flow" going on.
Hope this helps... be safe!

Jul 15, 2009 | 2003 Kia Optima

1 Answer

Heating problem


If you changed the thermostat yourself and have noted that the lower radiator hose is cooler than the upper radiator hose, you may have installed the thermostat incorrectly or have purchased a faulty thermostat. A lower radiator hose that does not get hot (or as hot as the upper radiator hose) is a direct indication of a faulty thermostat. Please vote for this solution if you found this to be helpful. Thanks,

Jun 01, 2009 | 2003 Jeep Liberty

2 Answers

I have a 2004 Kia Optima and about a week ago it started overheating. We replaced the thermostat and still the same problem. It happens mainly after running the air conditioning but now it has started...


sucks guys, i have the same problem, at the moment i'm replacing my radiator, just dropped in on a break :)
if it does stop overheating i'll let you know, i've also changed temperature sensor, not it...

Jul 20, 2008 | 2005 Kia Optima

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