CPU Heatsink :~

[swiss]

Originally Posted by 335th_GRAthos

Ehem, sorry Swiss, which fan do you mean should blow air into the case?

~S~

Rad=radiator.
Rad has to be cooled with outside-case air, given the rad is located inside the case you will blow warm(through the rad)air into the case - unless the rad is completely outside the case.
Getting hot air out of case is the job of the other fan(s).