Need help diagnosing failing radiator fan circuit 2004 Corwn Vic Pol Int

Radiator fan circuit is blowing the 50A fuse. Replaced the fan and controller module with a used part, and same problem occurs. I thought it was temporarily fixed as car idled 20 minutes and fan cycled as it should. Car overheated the next day after idling 10 minutes Found fan not running and fuse blown again. Refuse to blame the replaced fan/controller.

I was sold two relays at parts store, a 30A and 50A, but cannot locate a diagram which shows where these go. Assume they go in the battery junction box, but none are marked accordingly nor identified as such in owner's manual. Any ideas?

the relay box should be on driver side under hood

I am about to give up trying to replace factory parts because I still cannot find the location of relays for both low speed and high speed fan operation. Does anybody know?

Does anyone know if the factory fan is supposed to push or pull air?

When I directly supply power to the fan wiring connector, I can only get the fan to push air. Reversing the positive and negative results in fan not running at all. I have not resorted to cutting the wires just ahead of the fan motor and wiring directly as this will require pulling the fan/shroud assembly again...