Thanks for the help !
here is the results :
Temperature indicator fixed, the wire was not tight enough (thank you scooterwayne )
I removed the floor of the scooter and found the leak from one of the coolant pipes, fixed that too. The indicated temperature is somehow lower than before, shows just between 1/2 and 1/4 seems. The fill cap is looks full. can be because of trapped air ? how to release the air from the system ?
Thank you
