Well, make sure the vents themselves are cleared of any dust, etc.. Also, that the fan is also working like it should. Since, this is a case fan, that available space is allotted for a certain size fan. if the fan isn't working, then replace. Of course, you can exchange it for yet another fan of similar size, but most still would operate at a certain RPM level. In this aspect, don't much return unless you can increase RPM or size if applicable.
I suspect my pc has heating problems. It has been unexpectedly shutting down. I removed the access panel and found the area around the vent slots is blackened. My OS is Windows 7 64 Bit. My pc is an EMachines EL 1850 G. Can someone advise me on an upgrade for a fan that will resolve this issue? Thanks.