You can test the Aux. fan via the activation menu in INPA and via a few other tools too. It takes the guess-work out of it.
I've heard and read that the aux. fan should "kick" or turn a little at start-up but I've never actually seen it do it. But when I fire it up via INPA it spools up to full RPM with no issues. It's very noisy when running at full speed!!!
