@kulula
Yip, mine I changed the polarity to push air through the radiator and not extract it forward.

I think it is better to mount a electric fan on the inside of the engine bay so that it pulls air through the radiator. The idea of air being pushed through a radiator with fine fins like mine does'nt seem to work. i suspect also that because the fan is infront of the radiator it partially blocks airflow to the radiator.
But as mentioned, due to the thick radiator core there is'nt enough space between engine and radiator to fit it on the inside.
I want to later cut the radiator hole bigger and fit a bigger aluminium core radiator that is thin so that I can fit the fan on the inside.