Thermostat is fully open at 195. The 216 peak and quick drop is the electric fan switching on to draw air through the radiator. In warmer weather with the A/C running, you don't see the same wide swing because the fan is running already to draw air through the condenser.
Temp numbers are perfectly normal.

 

I'm seeing around 82c (180f) temps currently. Its about 5-8c(40-46f) outside.
In the summer months, I see the temps bounce around 92-96c...

 

I’m curious about the temperatures I’m getting in my 2010 Accent. On the highway traveling around 75 mph my coolant temp stays around 199-203 degrees Fahrenheit. It stop and go traffic I’ve seen the coolant temp briefly touch 216 degrees Fahrenheit then quickly jump down to 199-215 (highest) degrees Fahrenheit. I’m assuming the thermostat is opening at this time. Are these temps normal ? Thanks.

00000732
Best practices for requesting help:If you haven't done so fill in your vehicle info and profile page. At upper right corner under the search box click on user cp (it's your control panel)
This info will show up to the left under your user name and is very helpful.

• Be sure you are in the correct forum for your vehicle.
• Do a search for your problem. A lot of stuff has been asked and answered.
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• If the vehicle has been to a repair facility it would be nice if you could post a picture of that invoice/bill
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This information can save a lot of time and get you the answers you need much faster.


Thanks,
Welcome aboard.

 

00000732
Best practices for requesting help:If you haven't done so fill in your vehicle info and profile page. At upper right corner under the search box click on user cp (it's your control panel)
This info will show up to the left under your user name and is very helpful.

• Be sure you are in the correct forum for your vehicle.
• Do a search for your problem. A lot of stuff has been asked and answered.
• Do not double post for the same problem.
• Give the model year....Engine size...transmission type (auto or standard)
• Take a single issue at a time. Posting multiple issues at once will get convoluted very quickly
• VIN number can be very helpful
• Vehicle history can be good. How many miles. If not bought new, how many have you put on it.
• Describe the problem best you can. If a noise can you get a sound or video file
• Tell us what has been done, if anything, thus far. If tests have been performed give actual results not OK or passed. If scanned for codes the actual code(s) not O2 sensor or MAF, Etc.
• If the vehicle has been to a repair facility it would be nice if you could post a picture of that invoice/bill
• If your vehicle is under warranty you should have the dealer check it out. If it's a problem they see many times they will generate a safety recall of TSB. This is how they know of the problem.
  
  

This information can save a lot of time and get you the answers you need much faster.


Thanks,
Welcome aboard.

Thank you buddy.


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Fan comes on at 203F for coolant temp control assuming you are not going over 35 mph and the AC is not already on.

 

Your thermostat should be 180f which should be fully open at 200f. 220f is the safe limit but I would check into why your getting close to this. Check your fan and if its been awhile it might be time for new thermostat and fluid.

Your temps at this time won't damage anything but are on the high side.

 

I agree that the coolant temperatures seem to be on the high side, but it would be helpful if the OP mentioned where he lives. Nevertheless, I noticed in another thread he indicated that his mechanic says he needs a new water pump and the cooling system lost some pressure when it was tested. If coolant is leaking out of the system then that also means air is displacing it and air in the cooling system could definitely explain why the temperatures are running a bit high.

 

I live in Virginia.

Thank you for the information. Yes, I do need a new water pump and your reasoning makes sense.


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