Technical Excessive radiator fluid temperature

[jte]

Hi,

This warning message has come up a few times when the outside temperature is below -8 degrees celcius.

"excessive radiator fluid temperature"

It shows up on the infotainment screen on a stone cold engine when I turn the key to the ignition.

The coolant temperature gauge is in lowest position (which is right).

No fault codes.

15 seconds later when I start the car, it starts normally and the warning no longer appears.

The car runs normally after this and the warning does not appear on a warm engine.

It only shows up on a stone cold engine and only for a few seconds when the ignition is on.

Can coolant Can the coolant temperature sensor break down to the point where it short-circuits when cold and then warms up a bit when the ignition is on and starts working?temperature sensor broke that it is short circuit in cold temperature and when ignition is switched on it warms little and starts to work?

 

[jte]

Hi,

Forgot that no cooling fan activation.

 

[Mikeldn88]

I got that message a few times. Now got no parking help, and a few time flashing mileage.

I'm going to clean my grounding points when I have time this week. I suggest starting with that first.

 

[jte]

Hi,

I have cleaned all grounding points 3 years ago.

 

[jte]

I found in Polish Forum following result for the "excessive radiator fluid temperature" message:

This error even appeared on a cold engine, the cause was a failed sensor in the air conditioning radiator (pressure switch?) - it had periodic short circuits on the power supply pin and for some reason it also showed 130 degrees C/message etc
The culprit turned out to be the sensor on the air conditioning radiator (on the right, at the very bottom) - there was an insulation leak, it corroded, and stuck inside, burdening the ECU and sensors, which apparently use the same power supply line (according to a friend who repairs ECUs, some DPF sensor and the fluid temperature sensor use the same power supply). After replacing the sensor on the radiator, the problem never returned.

I have to look pressure switch connector.

 

[Pugglt Auld Jock]

I found in Polish Forum following result for the "excessive radiator fluid temperature" message:

This error even appeared on a cold engine, the cause was a failed sensor in the air conditioning radiator (pressure switch?) - it had periodic short circuits on the power supply pin and for some reason it also showed 130 degrees C/message etc
The culprit turned out to be the sensor on the air conditioning radiator (on the right, at the very bottom) - there was an insulation leak, it corroded, and stuck inside, burdening the ECU and sensors, which apparently use the same power supply line (according to a friend who repairs ECUs, some DPF sensor and the fluid temperature sensor use the same power supply). After replacing the sensor on the radiator, the problem never returned.

I have to look pressure switch connector.

Thanks for that. I'm making a note about this to remind myself if it ever happens to a vehicle of mine,