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- 2017 CX3 AWD
Is that OBD Fusion? OBD Scanner shows two. Seeing how the two values fluctuate gave me a better sense of the system's health. I also have a rad cap that shows the temp.
Warranty extension for fail-safe thermostat
- Thread starter Martyd
- Start date
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- W WA
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- 2024 CX-5 Premium
The app I'm using is OBDLink. I'll check again to see if there are two coolant temp values available.
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- W WA
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- 2024 CX-5 Premium
I checked again and indeed there are multiple PIDs for engine coolant temperature. I will have another look at all of the coolant temp values (there's Engine Coolant Temperature, Engine Coolant Temperature 1, and Engine Coolant Temperature 2.
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- 2017 CX3 AWD
My understanding is that the temp in the engine block stays high unless/until cooler liquid is mixed in from the radiator. The radiator, on the other hand, is equipped with a fan and fins to cool itself down to near ambient temp. I don't understand how the engine temp would drop to 175 at any point during an active drive, is that what CD does? I am not familiar with all the models/trims.
Good thing that you're watching the temp closely! Hope the other value will help make it make sense.
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- W WA
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- 2024 CX-5 Premium
I have some more data on the coolant temperature. This time I captured vehicle speed along with the 2 engine coolant temperature values. Temp 2 generally seemed to track along with Temp 1 but was 10-15 degrees cooler. Maybe Temp 2 is at the radiator and Temp 1 internal to the engine?
You can see that Temp 1 moves up and down in a range of 15-20 degrees. This corresponds with what I see on the gauge in the console. I expect the coolant temperature to remain fairly stable once the engine warms up.
I will likely go back to my dealer with this issue relatively soon.
To recap, my CX5 is a 2024 NA without CD. The thermostat was replaced about a year ago under warranty after exhibiting symptoms similar to what I'm seeing now.
You can see that Temp 1 moves up and down in a range of 15-20 degrees. This corresponds with what I see on the gauge in the console. I expect the coolant temperature to remain fairly stable once the engine warms up.
I will likely go back to my dealer with this issue relatively soon.
To recap, my CX5 is a 2024 NA without CD. The thermostat was replaced about a year ago under warranty after exhibiting symptoms similar to what I'm seeing now.
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- 2017 CX3 AWD
Can you look up coolant temp sensor on the parts diagram for your CX-5? That's how I found out that the second value (for CX-3) was for the radiator.
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- W WA
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- 2024 CX-5 Premium
I've looked but unable to find any temp sensors on the parts diagrams.
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- 2017 CX3 AWD
They call it water temp sensor.
18840C.
One is on the driver side of the engine near 15-17Z the water control valve. The other is on the passenger side near 15-010 the water pump. I may be looking at the wrong diagram though, there are variations between US/Canada and Mexico, with or without CD.
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On my 2014 the coolant temp#1 is the normal engine coolant temp and temp #2 is the temp of the coolant exiting the heater core. The sensor is at the firewall on the passenger side. With the engine hot and at idle, with heat selected (no a/c on) and with the heater fan off, both temps track close. Turning the heater fan on will decrease temp#2 as heat is removed from the coolant passing through the heater core. I've actually had them reading within 1 degree of each other. Lets me know my heater core has no blockage.
