re 97 dodge caravan

I had this problem with my old caravan.. the blower motor only works on high... I just bought a 97 caravan 3 liter and have researched the problem finding that it is probably a blower motor resistor that needs to be replaced... where do i locate the blower motor resistor on my 97 dodge caravan?
Any help with install / diagrams would be muchly appreciated.. I drove the old van for 6 months with only high on the blower motor... but would like to fix it on the new one if i can dit it myself...
cheers
terry