Cooling fans running more often than before :(


macrumors member
Original poster
Jul 4, 2003
The cooling fan(s) in my MacPro seem to be coming on far more often than when I first got it (about 10mths ago), it was almost silent compared to my G4. Any ideas why this might be happening? I've looked inside and it doesn't seem excessively dusty.



macrumors 603
Dec 2, 2006
the OC
is it hotter (outside temp) than it was 10 months ago? i had a powermac g5, and the fans were always on during the summer and on warmer days. the fans would rarely turn on during the winter.


macrumors 6502a
May 30, 2005
get some compressed air and clean it out. dust can prevent the cooling fins (on the CPU they are hard to see) from working properly and cause the fans to ramp up to compensate.


macrumors 6502
Feb 8, 2006
Did you happen to install more RAM modules? If you bought 3rd party RAM, it could be that the heat sinks aren't dissipating heat well enough as per Apple's specifications therefore, needing the fans to kick in.

Adding more HDs to the system can also increase the heat and result in the fans revving up.

But as the other poster said, use a can of compressed air and clean the fans and heat sinks in the system.

Monitor the temperature of your system (Temperature Monitor is a good app) and if after dusting out the fans (and making sure that the RAM modules are up to spec.) doesn't help, post back and maybe the other members on the forum who are more knowledgeable can help.