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Well oh so recently I had what sounds like the same problem.
Mine was the relay located under the hood.
I'm not sure of the difference between the 99 and your '03 but I'll take a picture of it's location for you.
Ok, took my durango to my dad, he tested the resistor (he's an electrician) and said it was good. Tested the fan, said it worked fine. He is now thinking the problem must be in the switch......
He's in the process of finding a new wiring harness. Any suggestions about the switch?
Thanks!
Dude, the harness is corroded all to hell! Cut it off and solder a new harness on from a junk yard!