Question about 2001 Kia Optima

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I have a 2001 Kia Optima that over heats

It's a V6 with roughly 170k miles. When i drive it, the temperature gauge slowly raises. This started last week. I made sure there is coolant in the reservoir and the radiator cap. There aren't any signs of leaking. The fan works as well and i don't hear any 'odd' sounds. The AC doesn't affect the temperature level and in fact, nothing that i do raises the temperature(other than just driving it). I want to get it diagnosed but i don't want to spend a bunch of money if i don't have to. Thank you

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  • Kia Master
  • 803 Answers

Start with a thermostat, if it has not been replaced, and recheck

Posted on Mar 18, 2014


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Posted on Jan 02, 2017

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SOURCE: 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.

Posted on Oct 01, 2008

  • 231 Answers

SOURCE: kia sephia o1

have your thermostat checked as it may be sticking, also your catalytic converter may be on it's way out.

Posted on Oct 09, 2008

  • 3489 Answers

SOURCE: leaking antifreeze

the location of the leak needs to be identified. it could be as simple as a hose or a leak in the block. sounds like you need to find a trusted technician to find the source of the leak and repaired before it causes more substancial damage.

Posted on Nov 09, 2009

  • 68 Answers

SOURCE: 2001 Kia Optima - Train sounding noise underneath

Sounds like the bearings are going out in the rear hub(s). Drive the car for a few miles (if it is safe to to do). Park it and check to see if the wheels are warm, or even hot, in their center cap area. This will indicate excess friction from bad bearings. Replace the whole hub. It's an easy DIY job, if you are so inclined. Part cost should be just over $100. per axle. Shop around to find a good price. I recommend Timken hubs. best of luck.

Posted on Jan 30, 2010

  • 1075 Answers

SOURCE: 2007 Kia Spectra has coolant loss. Pressure test

in this case i would suspect the water pump,it would not really show up in a pressure test ,put a paper liner under the car at night and see if any water shows up on it in the morning,if it is ok, then the water could be lnternal ie the engine is taking the water,but 2007 engine should not have this problem unless it has a very high more [simple] answer is the coolant leaking from a simple loose conaction and drying up before you see it ,but water leaves a trace so have a good look about the engine for that water mark,please rate this answer.adrian,,,,,,,,,,,

Posted on Aug 22, 2010

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have your thermostat checked as it may be sticking, also your catalytic converter may be on it's way out.

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