Not sure how to bleed sealed system? Recently adjusted weak coolant mixture by removing lower hose from expansion tank, draining off about 1L from expansion bottle & adding 1L of ethylene glycol anti-freeze. Left yellow pressure cap off while I warmed up the engine, purging bottom rad hose...

Ok before i explaine this whole simple process drain out and clean the radiator if you have to step 1: pour coolant in the radiator slowly into the tank step 2: after reaching the right amount of level of coolant, leave the radiator cap open step 3: ok now is the part where you start the car...