Only when driving up hill the engine temperature goes up

Tiny
JESSE_COPLIN
  • MEMBER
  • 2007 KIA SORENTO
  • V6
  • 4WD
  • 188,613 MILES
The car runs cool until I am driving up hill. At that point, going uphill, the temperature rises to the 3/4 mark and stays. Once I return to flat ground it cools down. I burped the unit and it seems to be holding, but I am confident it will return as I am not a mechanic and do not know the bottom line. Please help!
Tuesday, May 5th, 2020 AT 8:14 AM

7 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 110,176 POSTS
Hi,

If this only happens when you are placing the engine under a load, then I suspect it is likely in need of flushing the cooling system. I feel if it was the thermostat or another problem, it would also happen when driving on a flat surface.

I would start by flushing the system to see if that takes care of the problem. Here is a link that explains how it's done:

https://www.2carpros.com/articles/coolant-flush-and-refill-all-cars

Let me know if that helps. Also, let me know if you have other questions or need help.

Take care,
Joe
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Tuesday, May 5th, 2020 AT 9:05 AM
Tiny
JESSE_COPLIN
  • MEMBER
  • 4 POSTS
I am researching doing this on my vehicle now. I hope it works. Thank you!
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Tuesday, May 5th, 2020 AT 9:19 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 110,176 POSTS
You are very welcome. If you have a chance, let me know the outcome. Also, if you need help or have questions, let me know.

Take care,
Joe
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Tuesday, May 5th, 2020 AT 9:10 PM
Tiny
JESSE_COPLIN
  • MEMBER
  • 4 POSTS
So the erratic needle on the temperature gauge stopped moving all together and is sitting on cold at the bottom. I think it may be a sensor. But the 2007 Sorento has so little info online. Could it be a faulty sensor?
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Tuesday, May 5th, 2020 AT 9:17 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 110,176 POSTS
Hi,

Yes, the engine coolant temperature sensor (ECT) can be bad or the connection could be loose or corroded. The ECT is mounted on the cylinder head. I attached a picture to help you locate it.

Let me know if this helps or if you have other questions. Note, before replacing the sensor, confirm there isn't a connection issue.

Take care and let me know if you have questions or need help.

Joe
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Tuesday, May 5th, 2020 AT 9:29 PM
Tiny
JESSE_COPLIN
  • MEMBER
  • 4 POSTS
Thank you so much. I will have a go at it tomorrow morning. I will update as I progress.
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Tuesday, May 5th, 2020 AT 9:32 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 110,176 POSTS
You are very welcome. Let me know if I can help.

Take care,
Joe
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Tuesday, May 5th, 2020 AT 9:51 PM

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