The cyl head was taken off and new valves and new head gasket... After that it started to overheat and I had someone put in a thermostat and that didnt solve the issue.. So I noticed my rad was leaking so I replaced that and while I was replacing that I noticed that the cooling fan resistor was shot so I replaced that and the fan would come on. Also during all of this the coolant level would go down some but not a lot I would only add a little at a time nothing too much. I will test for a blown head gasket