Look on Car-Part.com--Used Auto Parts Market for the overdlow bottle ( that's what it is called there )
There are many reasons the radiator fan won't run :
1. bad fan controller
2. bad fan motor
3. bad wiring/connections

Unplug the fan connector and connect 12v from the battery to the 12v fan wire, and a ground to the ground connector.
( BE VERY CAREFUL TO NOT TOUCH YOUR 12V AND GROUND WIRES TOGETHER - YOU HAVE BEEN WARNED !!! )
If the fan runs then it's the other stuff.
The PTCM controls the fan control module digitally to set different fan speeds, the first thing to check is that the big fat 12v wire going into the fan control module actually has 12v on it.