A year 2002 article from Delphi says that a pusher fan cools a rad beter than a sucker fan...

why?....

it has something to do with the ideal gas law..... PV=nRT

This law states that in a given volume of gas, the number of molecules depends on its presure and temperature (did i get this right?? my molecular physics aint that good))

Simplifying it...in laymans term ...hot air expands

so in a pusher configuration, the fan works in the cold area where the air is denser with more molecules per volume

and a sucker fan works with slightly hoter air (heated up by the rad) which is less denser and with less molecules per volume.

in the end if you take 2 systems with fans spinning at the same rpm.... the one with a pusher fan will get more air molecules pushed through the rad colecting heat.

get the logics.....?