There is no flyback part cooling fan circuit, the fan is switched directly to ground. There is a resistor used to limit gate current from the MCU to the switching transistor, but is not part of the fan driving circuit…
Here’s the steady state information. I think the nameplate rating must be based on either worst case or more of a dynamic startup current.
I also measured the inductive kick of both fans, since there’s no clamping circuit.
Thanks to several people for bringing kick up, I added a 1N4148 as a flyback, here’s the clamped voltage of the 5015: ~-25V
Rather than soldering to the board - I left that untouched and instead soldered it into the fan connector on the new fan.