1996 Ford Contour Over Heating

The car overheated stalled. I installes a new thermostat, hoses, it over heats fairly fast 15 min. it buldes high pressure on the top hose and when I run it with the cap off it does not over heat. as soon as I put the cap on and put it in drive the temp shoots up. At that time the AC wont blow hot air nor will the vent seting. I've been told it has an air buble, and or a blown head gasket however I don't get smoke out of the tail pipe. When I open the the cap when over heated high pressure lots of air bubles come up through the filler tank.

Thanks
jvs25