M23

Hey guys pls help!

I've changed to the Koyo radiator with Nismo Thermostat since my old one was leaking and overheated the car a few times. I seem to have problems bleeding the air pockets from the new cooling system which i always hear water noises (hints for air lock) in the car while stepping on the throttle when idling. I only get heat from the vents when the car is really running for a while and after a few days it will overheat and i found coolant are forced to the reservoir tank (too much air i guess). I have tried bleeding the systems for a while now but i still hear those water noises and the engine still overheats after driving the car for a few days. I also have air popping out of the rad cap when the car has been cooled down for a day.

Is there too much air lock inside the system or my head gaskets have already blown and causing air to suck in?

Please help!