With the engine behind you and the rads up front there are a lot of hoses with nooks and crannies where air can be trapped after a flush and fill and it may take a while for all the air to make it's way to the recovery tank. I went through a similar issue and it took a few weeks to get settled down. Also, as Retroman said, make sure you have the newest coolant cap to ensure a proper seal and pressure vent.
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