Thanks richardb for the reply and the videos. They were very detailed and i will need them one day but i hope not too soon :P

I think that it was just the expansion tank failing since is common issue. After replacing it and also the water pump and radiator cap as precaution the car seems ok. ( i also wanted to replace thermostat but they didn't have in stock and i didnt want to buy aftermarket. )

The AC is still not that cold only on very hot days and on freeway ride but this is occasionally . I think i will have to go to ac ac shop to check the gas level.

Thanks