the easiest way to deal with it is to plug up the inlet/outlet ports on the engine that go to the heater. You may have a valve near the radiator coming out of the top of the thermostat housing that is designed to stop the coolant from flowing to the heater. If you can stop the heater from leakign you can then see if it stops losing coolant.
other than this "ill deal with it later" solution, you're gonna have to get the heater core 'outta there and fix it up.. Because its obviously a big problem and it will only get worse.
If there is no weeping coolant coming out of the water pump then don't worry about it, deal with the heater. You can plug the hoses or ports and run with it like that until you find a replacement.
~Steve
---- 1969 Bugeye ----
---- 1962 Dormobile ----