Simply remove the filler cap, start the car's ignition, and allow it to reach the desired operating temperature.
If there is still air in the system, you will see air bubbles at the top of the radiator.
The Eco light will only illuminate after the vehicle reaches its optimal operating temperature, which typically ranges from 85 to 90 degrees Celsius as indicated by the new thermostats.
If attempting to purge air from the cooling system does not result in an increase in the coolant temperature, it is advisable to consider the possibility of requiring a replacement thermostat.
