How do you change the fan relay for a Chrysler voyager?

It is located in the PDC which is the long narrow black box near the battery open the cover and on the underside of the cover is a diagram and use for all relays and fuses in the box, just lift it out. Another nice thing you will see the part number on the top of the relay which means you can take one out and substitute with another one to see if that is the problem.