Before you put new coolant back in after getting things sorted i would seriously advise using some RadFlush to give the internals a good clean up.
More people are born because of alcohol than will ever die from it.
You can give the engine a good flush using a garden hose. Just take two pipes off and stick the hose in and give it a flush until the water runs clear, then put the hose in the other end to reverse the direction of flow and flush it out the other way. You disconnect the radiator and do it separately. I also took my radiator off and blocked the inlet and outlet and then stuck it in a basin of water and let it soak for an hour to rise dirt out of the fins
It might be a good idea to take the water pump cover off as well and check that the pump is ok and that there's no crud built up
Update:
For now the problem is solved, I've found some replacement pipes from a local guy here and installed them.
They're used but in good shape.
Cleaned the system 3 times, a lot of rust got out.
For now it's not leaking, we'll see in the future.