Cooling fan runs continuously, trying to locate the relay switch

Replace the fan relays. The Radiator Cooling Fan Motor Relay is located: Under hood, driver side, front side of strut tower, mounted in relay panel
Application:
High speed The Radiator Cooling Fan Motor Relay is located: Under hood, driver side, front side of strut tower, mounted in relay panel
Application:
Low speed,here's a new part.
http://www.autozone.com/cooling-heating-and-climate-control/relay-radiator-cooling-fan-motor/duralast-relay-radiator-cooling-fan-motor/plymouth/voyager-2wd/1996/6-cylinders-3-3-0l-mfi/412240_0_0

Someone would need to check the fan relay for voltage and then jumper it to see if the fan will run.

There is a cooling fan relay, it should be in the box next to the battery.

Do they stay on all the time? By the radiator on the driver sideon the vehicles frame there is a little square box this is the cooling fan relay they are known for staying latched and keeping the fan running constantly. It's attached to the frame by to small bolts.

Check in fuse / relay box under hood on drivers side fender area. The description of each is on underside of cover of fuse/relay box.

The fan control relay is stuck in the closed position. It needs to be replaced.

The cooling fan relay on a 1996 to 2000 Plymouth Voyager The SSFR (Solid State Fan Relay) Cooling fan relay is located on the left front inner frame just behind the radiator. The radiator coolant fan relay is located on the inside front of the engine compartment near the left headlight assembly. You have to remove the air filter assembly, then look for a simple square relay with 4 wires running into it. It is mounted with 2 screws. It is the only relay at that location. If it has burned, you will need to replace the pigtail wiring harness.

Remove the air box beside the battery a 10 mm bolt and the relay is a four prong square box bolted on the frame with two 8mm bolts
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There is a fan relay in the fuse box in the engine compartment. Usually that is the reason why it won't turn off. It fuses in the on position. If you have the manual it will say which one is the fan relay. just pull it out and get a new one. They are not expensive.

Hope this helps

TRY SPINNING FANS BY HAND CAR OFF,SEE IF THEY ARE SEIZED. ALSO LOOK FOR BURNT WIRED ON FAN CIRCUITA S WELL AS MOST COMMON RELAYS FOR DAMAGE OR BURNT UNDENEATH

the cooling fan module is located under the air cleaner box on the radiator core support. very common problem .it is flat and about 3 inches long held on with 2 5.5mm bolts.