For some reason the fans in my MacBook Pro (2007 model) seem to run at full speed for no apparent reason, I've been using the "iStats" gem to monitor my temps and fan speeds – what's strange is that the CPU temperature often sits around 40 – 45°C even when the fans are running around the 2000RPM mark – yet occasionally, for some odd reason it decides to boost them up to 5000RPM+. I'll just be happily browsing the web and all of a sudden it decides its time for takeoff…
Anybody know a reason or possible fix for this? I've considered using some software to control the fan speed manually though I don't want to do anything that might potentially cause the system overheat.
Any ideas are welcome!
Best Answer
Trouble with fan speeds can almost always be solved by resetting the System Management Controller, or SMC.
Source: http://support.apple.com/kb/HT3964
The procedure for laptops with removable batteries is as follows:
Source: http://support.apple.com/kb/HT3964