1994 chrysler lhs radiator fan issues

I have noticed that the left side of the radiator fan assembly will not come on. Tried running ac to see if it kicks in, checked relay first, the fuse box, than jumped the fan to which it than worked, but will not work when plugged into the rfi module. I was going to replace the rfi module and cannot locate 1, Do these go bad?? Or can it have bad wiring.What are my options, or can this be fixed somehow.

Please help
Fran

After days of hunting I was able to locate a whole radiator fan assembly and pully the rfi module off at a junk yard, The oem part number for who ever needs it is 4592123. You can not purchase this at advanced auto, napa or autozone, But you can at Bob Caldwell OEM Mopar Parts (http://www.trademotion.com/partlocator/index.cfm?action=searchCatalogOEM&siteid=214295).
I have used them before and have very quick shipping.

Fran