I have read all the posts and just need a bit more guidance please ... So backstory 04 G35 150,xxx miles
Replaced radiator , rad cap , and thermostat today. Bought spill free funnel to "burp" system

After all new parts and running be the car with funnel this is going on ... STILL OVERHEATING :/ please help and thank you

Have you checked for a blown head gasket?

So I started reading some symptoms on here about the head gasket ... I stopped reading :/ it's going to the shop tomorrow I'll post back and see what the results are

Fans?

Nope not the fans ... Turns out it was a significant amount of air in my cooking system ... ! But even after the spill free funnel it did not help . So for 65 bucks my local shop hooked it up and problem fixed !

Yea, bleeding air out these cars suck. I recently bought an airlift device, which I have been itching to use. It creates a vacuum on the system and then sucks in all the new coolant.

I've bled the coolant on this car about three times and this is what I usually end up doing:

Takes about 1-2 hours - even with that spill free funnel.

Crank the engine a few times to 1K-2K then let it go with the cap off attached to the funnel. I do it for a few minutes with breaks in between. I squeeze the top and bottom radiator hoses to help get rid of bubbles and gauge how hot the hoses are. I then take the car out and floor the hell out of it and drive aggressively to get the air out, so I get hot air from the heater core. I haven't had any issues doing it this way.