for future referencee you can get a radiator "fluid sniffer" from most any parts store for under 50..
if there are ANY bubbles coming into rad it will tell you if you head gaskets are causing it...
you just pull the cap, put som special fluid in hte tool, and put the tool where the cap goes, then run car..
if it is getting blowuout of the gasket - the "special fluid" will turn a diff. color.