Question about 2003 Kia Optima

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

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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!

Posted on Aug 28, 2009

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Posted on Jan 02, 2017

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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 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

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2002 Kia Optima has a knocking sound until the engine heats up and then smells like an overheated engine, lots of clicking noises after you turn it off. Checked the antifreeze level, at the top, there is...


It's possible that your oil level is low or it's time for an oil filter change.
If not, it's possible that the rockers need adjustment, but I doubt it. Good luck

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2008 Kia Spectra. Overheating and no heat from the heater.


The window washer doesn't work in our 2008 Kia spectra, and we have plenty of fluid in the resourve

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2003 Kia overheating


When your car is running you should have your head engine checked for temperatures over 200F. If its not over 200 then its not over heating and you'll have to get your gage fixed. Make sure its not over heating because you can damage your head and that's going to cost you an arm and a leg. Make sure when you get it fix that they place your thermostat back that way its working properly with your emission control.

Jan 26, 2009 | 2003 Kia Optima

1 Answer

2003 kia optima over heating


out from bottom to top

Nov 13, 2008 | 2003 Kia Optima

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

4 Answers

2001 Kia Optima over heating


I figured this out and fixed it on my 2001 Optima. Mine was an electrical problem, not an overheating problem. The problem shows up when there is a heavier than normal load on the electrical system. For most of us, this is when the air conditioner is running full-blast on a hot summer day. However, it was also occuring when I ran the heater full blast. The heater running full-blast should have lowered the temperature, not raise it. So I tested the coolant temp while the gauge was showing it overheating. The coolant temp was not increasing, but the gauge showed that it was. It is caused by a bad ground connection. Another test you can do to see if your problem is the same as mine is this. As soon as the engine is showing overheating, pull over, park the car and turn off the engine. Immediately start the engine again and see what the temp gauge shows. If it still shows hot, you'll know you've really got overheating coolant. If it goes back to normal range, you'll know it's just a bad ground connection. Turning off the engine eliminates the resistance in the electrical system that has beeen building up and causing an erroneous high temp reading.

To fix: Either find and clean ground connections throughout the vehicle until it fixes it, or do what I did. A mechanic at the Kia dealer showed me this. I ran a new wire from an empty bolt-hole on the top of the engine to a bolt into the frame behind the engine. I only added a 6 inch wire and a new bolt into the top of the engine. The bolt into the frame was already there, so I just removed it, put the wire under it, and replaced the bolt. It created a redundant ground that prevented the build-up of resistance that caused the erroneous temp reading. It was a 5 minute fix and it has never done it again. Kia knows about this problem and they put out a post to their shops on how to fix it.

Jul 18, 2008 | 2001 Kia Optima

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