How do I change the heater core in my 2001 dodge caravan?

i just got done doing one this week and you have to remove the heater box so that you can clean it all out,you need a good repair manual on it because they got tips on doing that job in it that will save you a lot of time and effort,it took me about 6 hours total to do one,and that was really getting in a hurry with it,good luck.