I'm no expert so I cannot say with any authority. I have read on another post ( which I cannot recall) that someone else thought their thermo fan was running due to oil in ecu plug. You don't have to be an expert to check for oil in the harness/ ecu plug.
Just disconnect the negative battery terminal. And unplug the red plug from the Ecu located next to the jack in the same plastic box as the battery in the engine bay. If there is oil in the red plug than you have oil in the harness and it's probably only a matter or time till a fault shows.

