Your radiator is not circulating properly. Get this checked ASAP. Do as advised above. What is your temp gauge telling you. It otta be on the high side. If so, don't wait, you are flirting with a blown head gasket.
2000 Dodge Grand Caravan SE
No matter what you fix, there will always be something else to fix..
"Warranty" is just another way of postponing the inevitable.