No Electrical

I have a 2000 town car signature series. Having issues with it overheating. Hard to crank and stay running at first, but after I drive for a few minutes then cut it off, I have no problems recranking. I will throw out some key issues. Any suggestions will be appreciated. (Very much)

-Purchased a week ago n had no problems driving it from new Orleans Louisiana to brookhaven Missouri. Owner was towing company n said it sat up 5 months.
-Ball joint was broke, so had to reset fuel pump switch.
-New alternator and serpentine belt, battery, thermostat.
-EATC self diagnostics test returns no dtc's.
-Radiator fan does not kick on in low or high, with or without heater or A/C on.
-Jump wire connected from radiator fan to battery proves fan motor is okay.
-Checked 4 fuses/relays, locations: 50 amp maxi fuse #3 (high speed cooling fan) and #26 which is low speed cooling fan 30 amp in main fuse box under hood. Both were blown so I replaced them. And 2 big relays in small box in between breather and main box, for low and high speed. Swapped relays around and horn still blew so relays are okay.
-Not showing power with test light to 2 15 amp mini fuses in main fuse box under hood, locations #20 (fuel injectors) & #21 (heated o2 sensors, transmission solenoid, evap canister vent solenoid, EGR vacuum regulator, evap vapor management valve). Replaced both with new fuses, test light still wont come on. Is this normal or possibly an electrical issue? 
-Hoses from radiator n water reservoir have good pressure, so I don't think it is water pump.
-Have not seen any leaking hoses.
-Thinking a sensor could be the cause (coolant), but which one and how do I test it?
-Any ideas/suggestions? I have both owners manual and repair guide book, but I am female and am not a mechanic. Lol. So please be user friendly. :)

By the way, flushed radiator. Still overheats, even just idling. Check engine light is on.