Jetmax High temperature

[SOLVED]

Hello,
does someone know how to remove the air from the cooling circuit?
I am having troubles because of a screw not good fixed I have lost some coolant.
Today I went to the shop for to fix and he just put new liquid inside the cooling system.
After left I have seen the temperature very very high.
I believe that there are some air bubbles inside the circuit.
This is why I am asking how to remove these bubbles (if there are).
The fan works good, but the temperature still goes up.