do some research on the internet or go to the library and read the books... and some have 1st hand, hands on experience.
If it's the same as the 1999, it's kind of a knuckle buster. You have to take off the cross member that the hood latch is connected to. There are 5 bolts that hold the fan onto the radiator. The job is pretty simple but easier said than done. I would suggest that if you're going to do this job, it would be worth the 15 or 20 bucks to get a chilton's or haynes repair manual. Knowing what needs to be moved out of the way in advance is far better than figuring it out as you go. Anyhow, good luck.
We just had the same problem on a 2005 caravan. Auto parts store tested it and siad the alternator was bad. Took it to main dealer and they said the battery was bad. They changed the battery and all is well.
(Main dealer battery $160 so beware!!!!!) Try a new battery from somewhere cheaper.
You can also remove the alternator and take it to an auto parts store where they can bench test it and tell you if it is bad. They can do the same with the battery.