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2004 kia optima 2.4l mfi dohc want stop running hot has replace thermastant has check coolant no leaks and water pump ok.am i missing somthing?
Dirtyredd32
System air bound and need to be bled?
Hoses collapsing under pressure?
Radiator plugged or restricted?
Defective radiator cap?
My 2004 Optima has similar problem - I have replaced water pump - radiator hoses - thermostat - radiator cap - fans are working - system is not airbound - did radiator flush. Even purchased an IR thermometer and it is reading that the temperature is not actually getting hotter even though the temp gauge goes from normal to pegging red hot.
Dealer wants to replace the radiator, but as best as I can tell this is an electrical issue. It happens especially if the AC is on. Also - if engine is turned off and back on immediately (less than 10 seconds) it falls from Red HOT to normal. I refuse to go back to a dealer that can't explain/find the problem on their own car.
I've found cleaning your ground wire / negative battery terminal can help. For a more permanent fix I suggest replacing the temp sensor and not buying another Kia.
I have same problem. When a/c compressor is engaged temp gauge climbs,as compressor disengages,temp gauge lowers. It is NOT the radiator! Thermometer put into rad. neck says temp is at 185 at all times. Both fans and all 5 relays tested per factory repair manual,all ok. New thermostat and new temp sensor, new rad cap too.Problem still there! HELP!!
I have the same problem with a 2004 KIA. Took it to the dealer several times and they could not fix it. They even changed the dash panel and screwed up the odometer. KIA's service depts are the worst I have experienced. The last time I took the car in they tried to charge me even though still under warranty. Other mechanics have looked into this problem and have not found the cause. Although the car does not actually overheat the gauge pegs out in the red. Avoid the mistake I made and don't buy a KIA!
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