I tried cossie fans the wrong way around on my V8 Sierra, they do fook all even if you reverse the polarity and run them backwards

Granada 2.9 (pushrod) Scorpios have a very powerful blow rather than suck fan for the aircon rad that moves plenty of air and are cheap as chips from the breakers, I used one of these on a 4.5 V8 with stock XR 4x4 rad with no overheating probs

Mark