04 Optima Overheating - Page 2 - Kia Forum

 
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post #11 of 41 (permalink) Old 07-02-2009, 01:50 PM
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I have a very similar but different problem. I have a 2004 Kia Optima which is having issues with the temperature or temperature gauge. I had a problem where the temp gauge would rise, but if you turn off the car and turn it right back on, the gauge reads normally. Then after a little while, it will rise again or sometimes it won't rise for several minutes.

I had the thermostat and temp cooling sensor changed. It worked great for almost 2 weeks. Then it started this pseudo overheating thing again. So, we changed out the temp cooling sensor and thermostat. When we pulled the thermostat this second time, it was stuck open. So, we thought, we had it fixed.

Unfortunately, it has been almost 2 weeks again and the problem has arrived once again.

I think something is either causing the temp sensor or the thermostat to go out. But I have no clue where to go from here.

I have read this and a couple of other threads, and noticed an issue with the AC refrigerant. I will attempt to see if turning on or off the AC causes a difference with the cooling reading.

Has anyone seen a problem where the gauge is reading that it is hot, but if you turn off the car and turn it immediately back on that the temp reads normal for a at least 45 seconds before it starts to move anywhere ( if not longer)? I have actually turned the car off and right back on before and it didn't show the car overheating for at least 20 minutes once.

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post #12 of 41 (permalink) Old 07-02-2009, 02:15 PM
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well, there could be a few things.
coolant circulation and thermostat hesitation - once you turn off engine (engine, that is overheating) hot water/coolant will force opening of thermostat, once you turn it back on - hot coolant will be replaced with warm/cold and it stays like that for longer or not ...??
problems with ground on dash board or the sensor/gauge itself - check all cables
A/C issues - do what you said you would - look for any relation between A/C and engine temp

One more thing you can do - put a separate temperature sensor (go to autozone or something) and see if this independent reading is the same


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post #13 of 41 (permalink) Old 07-17-2009, 08:43 PM
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Quote:
Originally Posted by Marauders View Post
I have a very similar but different problem. I have a 2004 Kia Optima which is having issues with the temperature or temperature gauge. I had a problem where the temp gauge would rise, but if you turn off the car and turn it right back on, the gauge reads normally. Then after a little while, it will rise again or sometimes it won't rise for several minutes.

I had the thermostat and temp cooling sensor changed. It worked great for almost 2 weeks. Then it started this pseudo overheating thing again. So, we changed out the temp cooling sensor and thermostat. When we pulled the thermostat this second time, it was stuck open. So, we thought, we had it fixed.

Unfortunately, it has been almost 2 weeks again and the problem has arrived once again.

I think something is either causing the temp sensor or the thermostat to go out. But I have no clue where to go from here.

I have read this and a couple of other threads, and noticed an issue with the AC refrigerant. I will attempt to see if turning on or off the AC causes a difference with the cooling reading.

Has anyone seen a problem where the gauge is reading that it is hot, but if you turn off the car and turn it immediately back on that the temp reads normal for a at least 45 seconds before it starts to move anywhere ( if not longer)? I have actually turned the car off and right back on before and it didn't show the car overheating for at least 20 minutes once.
Yes! I have the EXACT same problem. I have been having this problem for too long and usually kill the AC and turn the heater on to make the gauge go normal. If I shut off and turn on, its back to the normal level.
I have flushed the cooling system, replaced the radiator and removed the thermostat with the same exact symptoms. I haven't replaced the sensor yet.
ONe thing I do notice is my gauge can jump into the red and go back down and the Check Engine LIght never comes on. I'm not sure if it would in a true overheating situation or not but its worth noting.
I'm out of ideas as well other than it being some electrical issue.
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post #14 of 41 (permalink) Old 08-03-2009, 07:39 PM
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I have 04 Kia optima my car is of course it reads overheating. changed thermostat once got a flush done dealer says it reads wrong ,but couple things I notice when it reads high it seems like lossing power, A/C seems like not blowing as cold when the gauge reads normal it's like everyone else says yes when I turn A/C off it helps my car overheats on high speed when it starts to move up and down it's like that all day also when the gauge shows its overheating I turn the car off start it right back it goes back to normal do you think it would be water pump it's kind of noisy
thanks
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post #15 of 41 (permalink) Old 08-03-2009, 07:47 PM
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Quote:
Originally Posted by Marauders View Post
I have a very similar but different problem. I have a 2004 Kia Optima which is having issues with the temperature or temperature gauge. I had a problem where the temp gauge would rise, but if you turn off the car and turn it right back on, the gauge reads normally. Then after a little while, it will rise again or sometimes it won't rise for several minutes.

I had the thermostat and temp cooling sensor changed. It worked great for almost 2 weeks. Then it started this pseudo overheating thing again. So, we changed out the temp cooling sensor and thermostat. When we pulled the thermostat this second time, it was stuck open. So, we thought, we had it fixed.

Unfortunately, it has been almost 2 weeks again and the problem has arrived once again.

I think something is either causing the temp sensor or the thermostat to go out. But I have no clue where to go from here.

I have read this and a couple of other threads, and noticed an issue with the AC refrigerant. I will attempt to see if turning on or off the AC causes a difference with the cooling reading.

Has anyone seen a problem where the gauge is reading that it is hot, but if you turn off the car and turn it immediately back on that the temp reads normal for a at least 45 seconds before it starts to move anywhere ( if not longer)? I have actually turned the car off and right back on before and it didn't show the car overheating for at least 20 minutes once.
my car is exaclly the same thing but do you notice when it starts to reads high does it feel like car is losing power ? and ac starts to blow warmer
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post #16 of 41 (permalink) Old 08-03-2009, 08:53 PM
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Quote:
Originally Posted by optima 04 View Post
my car is exaclly the same thing but do you notice when it starts to reads high does it feel like car is losing power ? and ac starts to blow warmer
power loose is normal when car starts overheating.

where do you live?

if A/C blows not cold, look if A/C works fine. First pressure (over- or under-charged); then compressor and pressure switches, next move to radiator - is it clean, not bent, all the fins are straight, can air move through it?
the air has to pass A/C radiator first to reach coolant radiator. if A/C radiator gets hot (insufficient amount of R134a in A/C system = warm air instead of cold) then the air gets so hot that is not able to cool down coolant radiator = overheating.
do the fans work fine?

other things to look for are air/fuel ratio (lean will make engine overheat), spark plugs, air filter, oil and so on...




EDIT:

to check if it is really overheating you can try to listen to it (if it is you should hear some boiling....). Another thing - check all connectors. get any aftermarket sensor...
when it boils you should see steam coming out from the radiator cap (it would release excess of pressure)


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Last edited by PLP; 08-03-2009 at 08:57 PM. Reason: overheating test
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post #17 of 41 (permalink) Old 08-04-2009, 06:59 PM
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I live in salt lake city the tech. cant find any problem they say its a temp. gauge but I dont think thats the problem so if I am lossing power does that mean car really overheats not a faulty gauge A/C normally blows really cold but when the temp gauge starts to go up I feel like it's not as cold as when it'snt acting up yes I had the radiator flushed as I was reading the posts someone said to check the A/C HIGH PRESSURE and LOW PRESSURE pipes low pressure is cold but HIGH PRESSURE PIPE IS TOO HOT I dont know if that is normal I checked the radiator it looks clean and no bent ,fins are straigh spar plugs changed 3k mile ago air filter oil I do most of the routine maintanence any idea what could it be should I change the thermostat the water pump is the original one would that cause a problem? thermostat temp standart at part stores are 180 F should I get a lower temp so it opens before ?
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post #18 of 41 (permalink) Old 08-04-2009, 09:31 PM
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Quote:
Originally Posted by optima 04 View Post
HIGH PRESSURE PIPE IS TOO HOT I dont know if that is normal I checked the radiator it looks clean and no bent ,fins are straigh spar plugs changed 3k mile ago air filter oil I do most of the routine maintanence any idea what could it be should I change the thermostat the water pump is the original one would that cause a problem? thermostat temp standart at part stores are 180 F should I get a lower temp so it opens before ?
high will be hot, its normal in hot air, but the thing is the radiator fan.
does the overheating happen in highway speeds or it happens ONLY in slow traffic (stop and go). If so, it may mean not enough heat is released to air from both radiators. In this case, there is nothing we can do. Sorry. It could be that KIA did not calculate that some cars will be used in temp over 110 F, so they need bigger radiators.
If A/C is fine, and pressures are all right, and without A/C being on coolant stays in normal range - dead end. The only thing you can do is to have an extra switch for radiator fan to make sure it is spinning all the time (or whenever it is overheating).

And YES, when it starts overheating you will feel loose of power and A/C will blow warmer air. A/C would be disabled by PCM or ECM in order to bring engine temp to normal.


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post #19 of 41 (permalink) Old 08-05-2009, 03:31 PM
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Cool I'm back with an update/resolution on my overheating problem

I finally had to throw in the towel and get my mechanic to look at it...it ended up needing a new radiator (temp readings showed wide discrepancies in hot and cole temps located at different points within the radiator)...Car's been running for about 2 weeks in daily 90+ degree weather here in the Pacific Northwest with no overheating issues (gotta find some wood to knock on...)
Thanks again for all the suggestions

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post #20 of 41 (permalink) Old 08-05-2009, 05:04 PM
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Originally Posted by PLP View Post
high will be hot, its normal in hot air, but the thing is the radiator fan.
does the overheating happen in highway speeds or it happens ONLY in slow traffic (stop and go). If so, it may mean not enough heat is released to air from both radiators. In this case, there is nothing we can do. Sorry. It could be that KIA did not calculate that some cars will be used in temp over 110 F, so they need bigger radiators.
If A/C is fine, and pressures are all right, and without A/C being on coolant stays in normal range - dead end. The only thing you can do is to have an extra switch for radiator fan to make sure it is spinning all the time (or whenever it is overheating).

And YES, when it starts overheating you will feel loose of power and A/C will blow warmer air. A/C would be disabled by PCM or ECM in order to bring engine temp to normal.
Yes it does that on highway with A/C on turning A/C brings it back to normal when the car was under warranty I had the same problem they replaced the thermostat like 3 years ago for a year it was fine but it came back so I wanted to see if the thermostat really works I filled up the spare tank with coolant and made the car overheat took the radiator cap off and the spare tank both but the water level was still the same even when I open the radiator cap and it spilled some out and I made the car overheat again I didnt notice coolant level dropped from spare tank so I am thinking its the thermostat when the A/c is off car is fine I shift gears on 5000 rpm never acts up but when I turn the A/C on then it suffers do you think my problem would be the thermostat or do you know if I can check that anyways? with old cars I use to take it off and put it in to the boiled water and see if it works but new cars arent like that I believe
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