From last two days i am facing the same issue.
Gasket is safe because of the temperature sensor which switch off the ac when engine gets to hot.
Seems like in your car that sensor is disconnected.. if it was connected it should give younsign like it turn off the ac.
And ues you are right. Temperature needle on dashboard says everything is noce and cool.. and at that moment radiator was almost blown.
I am facing this issue from last 2 days..
After every 5 kilometers i have to check the water bottle..
Please advice.. what to do?
Today is Sunday and i want to get rid from it.