I fought air in my system a bunch so much that I was sure it wasn't air anymore and even sent the water pump to be checked out... but it was still air.
Filling the engine from the upper radiator hose - wasn't enough
Filling the rest of the radiator while the front of the car was jacked up - wasn't enough.
In addition to the above two tips I also had to keep the car raised up and run the engine to cycle the thermostat a couple of times with the radiator cap off to bleed out the air before I removed it all.
My radiator is double cross flow and the cap is on the opposite side of the hoses. This means with the cap off and looking down I can easily see how much fluid is flowing through the radiator and when the thermostat opens. I would see the thermostat fully open. Put the cap on a few seconds later to avoid a huge mess and then remove the cap again once the thermostat began to close. I did this multiple times to be sure.
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