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I'm bumping this as it's the only thread I can find that describes almost the same identical issue that I have.
One hour bleeds; water pump/thermostat replaced. We've done a bunch of independent tests to make sure the head gasket is not blown and it continues to drive normally until the yellow "Engine Over Temp" light comes up on iDrive.
I know an air pocket is likely but what has anyone first hand corrected this? If so what was the action.
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