Air flow

[Trace_hunter]

I have a fan which I unscrewed a while back to try and cool my GPU (which failed) but now I can't remember which way it was facing. As in, should it be blowing air into the case or sucking air out of it. I have a CPU fan, a PSU fan and this stray fan, what can I do with it to help keep my system at the lowest temps? because I had to buy a new GPU as my old one kept over heating and I don't want this to happen again.
(pictures soon)

 

[bomberboysk]

Intake if you have no other case fans, as psu's are usually exhaust fans.

 

[MixedLogik]

Upgrade to better fans. I did this awhile ago and my case is always about room temperature. You also show place your fans in a effective posistion. If you have a fan inproperly placed, than you could be doing more harm than good.

 

[RavenPerch]

i've done a few personal researches and they all have concluded to one thing. the airflow in a pc should be as: blowing cool air in from the front and exhaling cool air out the back. the cpu fan should blow air onto the heatsink.

now depending on where the fan was, evaluate what operation it should be doing.