Hi there, thank you for the donation,
I am presuming that your are referring to a cooling system flush here, the most important thing to ensure is as you said, is that cooling system is bleed of all air, secondly the thermostat should be tested and replaced if found to be slow in opening or in any way faulty, the radiator should be cleaned, not just with a back flush, but an internal core clean as core tubes can be blocked causing reduced flow and the cooling fan should be checked for normal operation, if all these were not done with the flush, I am sure that the problem will be found here.
Mark (mhpautos)
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Monday, July 12th, 2010 AT 5:18 PM