Should my CPU fan suck or blow?

[VunkJr]

Hello,
I have an old pc with Pentium 4 and I have just messed with it, I took it apart and put it back together. And the CPU cooling is done by a heatsink and a 80mm fan. But I don't know if it should be blowing or sucking, when I put my hand close to it, i feel that it blows cold air on my hand. So is it okay or i should flip it over? (also the arrow's direction points out from the cpu)

 

[ccampy]

If its a top dow cooler were it the fan faces the motherboard its best to hsve it blowing down

If its a vertical ones its best to have it facing the rear of your case to get the hot air out of the case

 

[cody_mckee]

It should be pulling air through the heat sink, not away from it.

Many of the P4 systems I have messed with have the fan up front which pulls air through the heat sink, then out the back and through the PSU fan.