Location of 98 OA Ultra Coolant sensor

I get every few minutes a low coolant level message.
coolant level is fine, so I suspect tyhe sensor.
I got a new sensor, but I am not sure where the coolant level sensor is located.
There is a sensor in the front of the Radiator, but it might be the tempruture sensor.
Thank you,
Roy Wagner

that's the low coolant sensor.

Thank you.
I changed the sensor and it solved the problem.