Hi guys, figured with all the great help I got on my last issue I would try here again...I have a 95 windstar that I rebuilt last year do to head gasket failure. All has been great until a few weeks ago. Traveling down the interstate I blew my top radiator hose and had to drive a bit to get into a lane I could pull off in. Replaced hose and filled cooling system started van and poored white smoke out of the exhaust...Made it home without over heating and did a block test and sure enough the blue liquid turned yellow right away... Did not feel like redoing gaskets and not sure if I could cause I had a ton taken off the heads when it was machined so I went for the blue devil..Followed directions to a t and all went great. No exhaust in the cooling system and the van ran like a top with no smoking. HOWEVER lol..I have been getting air in the cooling system somehow and it over flowes the coolant tank. The water that comes out is not boiling hot, just warm.. I have block tested it a few times still no gases, I have pressure tested the cooling system and no leaks there, I have done a compression test and nothing wonkie there either. Drove it 60 miles today and still expanding into the over flow with some bubbles but did not over flow and temp stays in normal range..My first thought with air coming into the system is head gasket, but I would think it would show on any of the other tests. Can I be pulling air in through somewhere else? Would intake gaskets allow air in? All hose, radiator cap, thermostat and water pump were replace at rebuild. Thanks for any help