I bought a 1996 Taurus for only $100 because the guy was sick of it and wanted it gone. He had a head gasket fail so he took the heads in had them checked out and also rebuilt. He also put in a new heater core and radiator. It drove for about 10k miles than the coolant started overflowing out of the reservoir. He claims that he also used new head bolts. I diagnosed for a bit. It runs for about 3-5 minutes and then starts to rise out the tank. The coolant really does not get all that hot. I see no movement whatsoever as far as flow or bubbles in the tank. It looks like still water then just raise up and over. Not one bubble. I did a compression check and every cylinder was basically 125lbs. The car has 129k on it for miles. I started tearing down to replace head gaskets. I took the upper plenum off and noticed the intake gasket seems to leak coolant pretty good. Also it is funny to me that I see no water movement at all in the tank. I wish I would have thought about it more instead of starting to tear it all apart but could the water pump fins be broke and maybe causing it to rise out? Or do I have to bite the bullet and replace head gaskets. Again head gaskets were replaced 10k ago with rebuilt heads.