Temperature data, recorded over 1 hour.

[D.J.]

I recorded some temperature data from my OBDII reader, just for fun, on my drive to work today.

Starts at -6C (ambient air)
Transmission warms up slowly and stays cooler than I expected.
Engine oil is also colder than I expected (CVVT temperature is engine oil temp)
I find it curious how the coolant temperature never gets to a stable temperature, always gets to ~104, then quickly dips by over over 10 degrees, and then climbs back to ~104 - and repeat.


Basically, useless data, but possibly interesting data for some. - enjoy
3 charts - 1 with labels.





App = Car Scanner.
Actual dongle I am using = this one BT 25k80

 

[Thomby]

Cyclical coolant temp is going to be the radiator e-fans switching off and on, usually somewhere between 200 & 225 F or ~100-110ish C.

Just for fun I looked up the coolant thermostat temp, which I thought was usually 180-190F or 80-90C, but the Stinger test procedures say it opens between 203 & 212.

I guess in something as new and complex as our cars there's probably much more active management of the fans vs. a simple on/off temp.

 

[D.J.]

Cyclical coolant temp is going to be the radiator e-fans switching off and on, usually somewhere between 200 & 225 F or ~100-110ish C.

Just for fun I looked up the coolant thermostat temp, which I thought was usually 180-190F or 80-90C, but the Stinger test procedures say it opens between 203 & 212.

I guess in something as new and complex as our cars there's probably much more active management of the fans vs. a simple on/off temp.

I have my doubts about the fan. The fan is off - - from about 9:00am to 9:30am on the graph, I'm driving at ~ 80kph (50mph), with ambient temperature of -6C (21f). No fan needed under those conditions.

I am aware of the thermostat higher than typical opining temperature, plus the electric assist when driving under high engine load (not during this commute).
I really expected the coolant temperature to stabilize to some happy temperature, like 90c or 95C, but it never does. goes up to 104/105, then plummets - then repeats the cycle. No fans a this speed.

 

[Ah GetFd]

The reason for your coolant temperature goes back decades.

When you start your vehicle from cold the thermostat is closed.

This allows the coolant in the engine to circulate to increase in temperature. This also gives you quick cabin heating on a cold day.

Normally the thermostat will open around 99C and the temperature will drop back to around 89C.

This allows coolant from the radiator to mix with the engine coolant which lowers the temperature.

As the mixed coolant increases in temperature under normal conditions it will stay at around 90C. If you are driving in slow traffic where there is insufficient air flow, the temperature may climb again.

Once the temperature reaches 104C the first fan will operate and the temperature will drop again.

If the temperature continues to climb above 104C a second fan may initiate.

If you have the aircon on that activates one of the electric fans anyway.

This is normal temperature fluctuation across all vehicles (EVs excepted)

 

[ElChanclo]

Interesting. How did you manage to get the wheel temps?

 

[D.J.]

Interesting. How did you manage to get the wheel temps?

OEM TPMS actually has this data, but it's not displayed on the car.

Using an OBDII Bluetooth dongle, was able to see live pressures and temperatures.

I was pleasantly surprised.

 

[ElChanclo]

OEM TPMS actually has this data, but it's not displayed on the car.

Using an OBDII Bluetooth dongle, was able to see live pressures and temperatures.

I was pleasantly surprised.
View attachment 84356

That would be pretty bloody useful to know!

Which OBD dongle and software did you used? I'm assuming this is off an android phone?

 

[D.J.]

That would be pretty bloody useful to know!

Which OBD dongle and software did you used? I'm assuming this is off an android phone?

Updated the first post in this thread with the details (end of first post).

Also here

2019 Kia stinger GTS losing power on the freeway after reaching a certain speed

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