These models had a problem with faulty cooling fan relay modules causing the fans to stop operating. Many of them are covered under a service campaign (voluntary recall) by the manufacturer. Plugging a new part on will not correct the problem; new software must be installed in the vehicle's powertrain control module as part of the repair, so this is not something you can fix at home without special equipment to reprogram the vehicle's PCM.
I would suggest calling your local Chrysler dealer and mentioning the sevrvice campaign in the TSB, and asking them to run your VIN number to see if your vehicle is covered and whether the update has been performed yet. If it is covered, you can get it fixed for free.
Below is part of the TSB with reference number so that you can discuss this with the chrysler dealer service dept...
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To: XXXXX XXXXX and Chrysler-Plymouth Dealers
Customer Satisfaction Notification # XXXXX -- radiator fan relay and Reprogram Powertrain control module
1998 Model Year Dodge Caravan and Grand Caravan; Plymouth Voyager and Grand Voyager; and Chrysler Town & Country (NS) Vehicles Equipped With a 2.4L, 3.3L or 3.8L Engine ("B", "G","R" or "L" in the 8th VIN Position) Built Through
November 26, 1997 (MDH 112623) at the St. Louis South Assembly Plant ("B" in the 11th VIN Position
December 1, 1997 (MDH 120109) at the Windsor Assembly Plant ("R" in the 11th VIN Position)
The radiator fan relay on about 150,000 of the above listed vehicles, may not turn on the radiator cooling fans. This may cause the engine to overheat. To correct this condition, the radiator fan relay must be replaced and the Powertrain Control Module (PCM) must be reprogrammed (flashed).