Normal engine coolant temperature ? - Kia Forum
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#1 (permalink) Old 08-16-2009, 09:58 PM
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Default Normal engine coolant temperature ?

I've just got an OBD II scanner since I am Preparing to tow a big trailer. My question is - what is normal engine coolant temperater and what is the maximum? Currently it shows around 200F or 92C.
What is the maximum allowed temperature when I shall stop and let it cool down when towing a trailer?
I have Sorento 2003 3.5
Thanks !
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#2 (permalink) Old 08-16-2009, 10:48 PM
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If engine temperature goes beyond 98C than you may start to worry. Most of the time 95 is the point when the radiator fan will be triggered, and it still far from overheating.
For coolant, boiling point (overheating) is around 110 C, if you add pressurized system to it, it will go up to 120 or so.
In case of too high temp, either slow down and INCREASE rpm, or stop and let it idle at around 1500 RPM (to induce fast flow of the coolant).
Eventually turn on the heater but I would refrain from using A/C, at lest on the beginning, to see how it goes.


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#3 (permalink) Old 08-16-2009, 10:48 PM
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Most modern engines tend to run around the 190-200F mark. It is set at that level for emission reasons. Run a good coolant mix and you will have a little more leeway.

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#4 (permalink) Old 08-16-2009, 10:52 PM
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Default Normal engine coolant temperature ?

to the Forum. Can't help you with an actual temp. If you try to keep it as close to the middle of the gauge you should be good. You might consider an Automatic Transmission cooler. They do wonders keeping the Trans cooler which in turn will keep the engine coolant from working as hard. If you plan on towing a lot get an oil cooler as well. Any amount of excess engine heat that you get rid of will make things run cooler.
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#5 (permalink) Old 08-17-2009, 02:40 AM
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Thanks, guys!
More questions...
1. So what is the temp when I should stop or slow down? Is it 105 or 110?
2. To slow down and keep high rpm - do I just switch to 2nd gear? Or how? What would be recommended speed and rpm for cooling?
3. Any advices on better coolant mix?
4. It seems that I have factory installed transmission cooler -isn't it that little radiator under main radiator?
5. Anyone can advice OBD2 scanner that can read transmission temperature on Sorento 2003?
I am in Kelowna, British Columbia, Canada. Mountains are all around, however usually it's not too hot there - around 20C or so. It could easily be 35 in the valleys, but I do not think that it would be a problem...
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#6 (permalink) Old 08-17-2009, 08:00 AM
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You can get ScanGauge to read more than temperature (scangauge.com)
Well, you may get hotter going uphill, and cool down going downhill. Yes, when you see temp is around 105 and above, I would let it cool down.
Yes, it might be 2nd gear if the terrain is flat, if uphill - stop.

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#7 (permalink) Old 08-17-2009, 01:03 PM
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Default Normal engine coolant temperature ?

I am sorry. I should have said an Auxillary Transmission Cooler. The samll one that is on there already is fine for every day use but when towing I would add 1 along with an auxillary filter.
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#8 (permalink) Old 08-17-2009, 03:41 PM
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Default Towing In CDN with 2003 3.5 Auto

If coolent is good and has been replaced like it should have been done since 2003. And there is not sludge in radiator blocking some flow form not doing that. And the 195 thermostat is known to be good or has been replaced in the last 6 years with the coolent. And the trans has been serviced ever. Try the first trip with the O/D off. And see how it goes. If it still gets hot then you might need to put in a 192 stat. Only tow, and this is really important in O/D on LONG level flat ground and roads. Best if you never do it but if you have to for MPG sake and it poses no heating up of vech in the flatlands ok. Anything else and never tow in O/D. Lock out O/D so it does not go in at all which is the prefered thing to do. That will overheat trans in a heart beat. Sounds like where you live you will never use O/D thou. When in doubt and temp gauge is going up, before it gets bad turn on heat on high. Do not wait. Most all of our vechs run at the half way or lightly less mark on almost everyday with a good fuctioning system. If it goes over half and is heading for 3/4 or IS there, turn on heat open windows and be safer then sorry. The room will have A/C when you get there, standing on the side of the road will not ever.

P.S. It is also not real smart unless your a mechanic to drive around with the OBD II plugged in and in diagnostic mode for the heck of it while on a trip. If you like you can pull over and plug in adn test it and look at temps. But it is not a good idea to leave it in just going down road as a monitor like I think you are saying. Mech yes do it but they do it short term and only while looking for things on a road test, not on trips. All you have to do is hit one wrong key or program code and you blow the ECM/TCM on route to where you should have been going. But will not since you may fry the vech electrics in its tracks. Or at best turn off something you need while towing. Like the eng coolent fans. Or put teh trans into limp home with the trailer on teh back.

Last edited by 04SorentoLX; 08-17-2009 at 03:56 PM.
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#9 (permalink) Old 08-18-2009, 01:32 AM
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Thumbs up Solid info !

Thanks for the info, guys!
It's solid!
I will ask the wiring place about auxiliary transmission cooler. I guess in this case I will not even need to monitor transmission temperature (since it will additional to my factory installed one)!
I have 2 OBD2 scanners - one is like a trip computer that shows consumption, engine temperature, calculated load value (what is that, BTW ). I think it is pretty safe to keep plugged - it's designed for that... I've purchased today regular OBD2 scanner, but according to 04SorentoLX advice I'd better return it back to the store, right?
Oh, and the question is how would I lock O/D out??

I have 4-gear transmission, so this will mean that I tow on third gear, right? What is the maximum speed or RPM on this gear????
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#10 (permalink) Old 08-19-2009, 04:34 PM
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Originally Posted by DenysK View Post
Thanks for the info, guys!
It's solid!
I will ask the wiring place about auxiliary transmission cooler. I guess in this case I will not even need to monitor transmission temperature (since it will additional to my factory installed one)!
I have 2 OBD2 scanners - one is like a trip computer that shows consumption, engine temperature, calculated load value (what is that, BTW ). I think it is pretty safe to keep plugged - it's designed for that... I've purchased today regular OBD2 scanner, but according to 04SorentoLX advice I'd better return it back to the store, right?
Oh, and the question is how would I lock O/D out??

I have 4-gear transmission, so this will mean that I tow on third gear, right? What is the maximum speed or RPM on this gear????
Depends on how your OBD II (trip comp) is wired in. I am still leery of anything pluged into the OBD II factory dash port other then when a mech is doing a test drive. But it is up to you. Sometimes they sell things that are not in your best interest and assume you do not know better or care jsut to get your $ and then "oh well we made no claims" if you blew the ECM/TCM it is not our products fault. But that does not help you on the side of the road when you were playing where you did not belong. AS for returning the other one? It is a good tool but just that a tool. If you bought for the gee wiz guys look what I got factor then yea return it as you will never use it properly and it will sit in your tool box collecting dust. But if you do know how to use it and will use it how it is intended to be used sure it is a nice tool to have.

LOCKING OUT O/D? look on the shifter handle/head on the driver side below the BIG push button. Small push button marked if ink is still there O/D ON-OFF. Hit it and the ORANGE dash light O/D OFF comes on (or should) on the instrument panel next to the TACH. It means you are in 1-3 mode. As for speed? 3000 rpms is a good idea more or less you got to play with it to see. If you go in 3rd @3000 more or less then you should be going (a guess) 60-65? with the gears we got. As in O/D it will be going 70-75 at @3000 like mine does no trailer. But load factors in too. SO use your head and if 3rd and the trailer in the hills and such where you are going at @3000 gives you 55-60 then that is what you do and drive it at more or less. DO NOT go 4500-5000 just because you want to go 70. Vech will never go what you did without a trailer and in O/D ever. That is the price for pulling that trailer you have to. Again if you need to go 70-75 then buy a Tahoe or Expidition or Armada or Boreggo or Sequiea. Sorento is not eth vech for you to use. Nor would be a 3.4/4.0 FOURUNNER nor 3.3/4.0 PATHFINDER really. Nor would ahve been a 3.9L Dakota. My old 2002 Durango 4.7 5spd auto might have been as light as I would have gone and still pull 4500-5000lbs and go 80mph or try. But then 10mpg towing is wonderful right? And 14mpg towing totally nothing day in adn day out.
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