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Hi,
The "easiest" way to see if the sensor is bad is to connect a scan tool to the van that is capable of reading and displaying the engine coolant temperature. If it appears to be changing in a reasonable way (goes up as the engine warms up, goes down as the engine cools), then the sensor is probably OK.
If you do not have a scan tool, then you could use a multimeter to actually measure the sensor values (resistance) as the temperature of the engine changes. Just set the multimeter to the Ohms or Resistance scale, and check the values of the sensor when the engine is cold and as it warms up. Again, this value should change as the temperature changes.
I have included a link that shows the location of this sensor (look at the bottom row of pictures).
Good Luck, Greg
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