ok so i gather that youve had the hose fixed and just filled it up with water and no coolant?? that isnt all that great for an engine, and its amazing it hasnt overheated majorly.
i recommend that you buy a bottle of nulon radiator flush(or any other brand) and follow the instructions, poor it in your radiator then run it through it(by running the engine for 20mins i think it says) then empty the radiator out by undoing the stopcock on the bottom passenger side of the radiator or just undo the bottom radiator hose and let it all out run out into a container(dont let it out into the drain its not all that great for the environment) then make sure you do up the stop cock or reconnect the radiator hose..
then mix up the coolant and water and poor it in to the radiator, the details on how much coolant to water you need should be in your owners manual(in your glovebox)
it may also be a good idea to replace the thermostat (about $20) before putting new coolant/water in.
also next time you have a question like this try searching the forum for your answer, there is a detailed right up in the faq section about changing your coolant.
thanks,
james