Question about Kia Optima
Posted on Dec 21, 2010
AutoZone.com lists the following procedure for several engines. If your engine is different, try going back to autozone.com with exact engine spec.
Removal & Installation
1.5L, 1.6L, 1.8L & 2.0L Engines
need help on changing thermostat - enlarge_tooltip.giffixya.net/uploads/images/enlarge_tooltip.gif" alt="enlarge_tooltip.gif" class="h_mi" /> Fig. Exploded view of the thermostat-1.5L engine shown, 1.8L simneed help on changing thermostat - 0996b43f802066a4.jpgr />
Fig. Water inlet fitting (A) and need help on changing thermostat - 0996b43f802066a0.jpgne
Fig. Use a new gasket (A) when installing the thermostat (B)-2.0L engine shown
2.4L & 2.7L Enginneed help on changing thermostat - 0996b43f802066a3.jpg
Posted on Aug 25, 2010
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Posted on Jan 02, 2017
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
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