Thats lots of information, thanks! I couldnt find this problem on forum, because its not very usual overheating. As far as i know, my car just had engine bottom cracked and replaced, so cylinder head is skimmed, cambelt, water pump and all the gaskets are new, but not sure if genuine. The cooling system is full with no air and non genuine new radiator cap looks like working fine, so i consider there may only be three things causing overheating - coolant, thermostat or radiator. Even with temperature reading on the dashboard just above the normal i can hear the coolant boiling at the top of the radiator... As far as i know the propper coolant shouldnt boil to at least 130 degrees by celcius, so maybe thats the problem