You can see if it is drawing the air by putting a piece of paper in front of the radiator.

My car never got hot but my uncle asked me one day why the fan was on baackwards.

I had just put it back on the way it came off when I did an engien chage from what it had when I first got it.

I never even looked at it. Sure enough, it was backwards. The correct way caused it to lightly hit, guess the peopel didn't think to straighten up the blades.

Made no difference in cooling when I got it right.