We'll, I'm in Montana right now and about 1000 mi from my lab so I won't be able to check until next week, but I sure thought I had mounted it to produce air flow in the same direction as the original. It sure doesn't look that way in the pics, does it!
I may have reversed it after I took that pic. I honestly don't remember - it was quite a while ago.

The yellow wire has nothing to do with the temp control. IIRC, the fan has a thermistor mounted near it's center on the intake side. Since you can't see it in the pic it makes me think the fan might actually be pulling air out of the heat sink as pictured despite the orientation of the blades.
I can say that it's worked fine since the install including when used as an electronic load. But as I said earlier the ambient temp in my lab is usually on the cool side so maybe I've been lucky.
I'll investigate more next week.