Hi. I have 2 Caravans, 2002 and 2007. The heater fan on the 2002 works fine, but the fan on the 2007 does not.. I hooked the fan (2007) direct to my battery and it worked. All the fuses check out. I swapped resistors... the 2002 works just fine. but the 2007 still doesn't. I even swapped some fuses with no success. Suggestions for additional steps would be appreciated. Thank you in advance.