After getting my car flushed and radiator flushed...New thermostat and housing and new fans...My car still over heated....So i figured maybe i have a air bubble in there or something....

So i cut the car on but took the reservoir cap and let it run for about 20 minutes and it didnt over heat...So i kept the car on and put the cap on and it over heated right away...

So im trying to figure is it because it needs to bleed or there's a air pocket in my system or what? Ad if so how can i fix it??