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Message: <blockquote data-quote="MustangChris" data-source="post: 1214041" data-attributes="member: 10830">so, if you dont fill it from the cross over tube, you're only filling half the system (the over-flow side).You'd have to wait until your thremostat opened before the fluid would fully circulate the system...That being said, if you only filled from the overflow tank when you did the flush two weeks ago, you may have overheated the heads or something (I'm not an expert on coolant flow passages) causing the head gasket to come into question.if you filled (this time) both the cross over tube AND the over flow tank, while squeezing the hoses, with the front end jacked up, etc. etc., you've got a much better shot at removing all the air from the system.did you replace the cap with an OEM unit.  When I did mine I didnt skimp, I went to ford and busted out the extra dough for the OEM unit.</blockquote>