If there is no water pump, there is no way to test the engine. Everything will leak out where you put the pump. To test the radiator, remove the outlet hose, and spray water from a hose in the intake hose, under pressure, while leaving the cap on. It should flow out with not much pressure loss.
Are you loosing coolant? Externally, internally? Check your oil, any coolant or foam in it? Check your coolant, any oil in it. When a head gasket goes, you typically burn the coolant in the cylinder and it doesnt get mixed in with the oil. That is bad for the cylinder. When the pumps fail, it is usually by leaking. If you have an external leak and are just low on coolant, that would cause it to over flow. You could have an internal clog that is restricting flow in the enginer that is causing it to over heat. How clean was your fluid?
We need more info.
Wednesday, June 25th, 2008 AT 5:58 PM