I have a 97 T&C with 3.8 AWD and had the same problem. I changed the thermostar (easiest first) no help, I removed the fan abd tested it with direct current worked fine, then I changed a sensor no help, then I had to do a head stand and grow another hand to change a relay on the front of the engine compartment at the side of the radiator, WALLA! Got the sensor from the Chrysler dealer and just a simple plug in for electric change over. Don't know if this helps but it took me about 2 weeks to find the **** relay next to the radiator.