IMac overheating? fan far too loud

fitzroy67

macrumors newbie
Original poster
Apr 7, 2014
3
0
Hi, I've had an Imac for three years and over the last two months the fan has come on quickly and gets really loud with little activity like just typing on Word. resetting the SMC and cleaned the vents, but no joy. I've just installed istat and got this feedback: cpu fan 3419 temp 44, hdd 1099, odd 1327
any help gratefully received
 

photosmike

macrumors member
Mar 10, 2010
71
1
The CPU Temp is reasonable but the CPU fan speed is not.. I suspect that the temp sensor is faulty. Unfortunately it is difficult to replace. I don't know which iMac you have but, here is a link to an iFixit guide that will give you some idea of the complexity of the repair. It is for a mid 2011 21.5" iMac.

http://tinyurl.com/nqfrts8

You could try using software to control the fan.

http://tinyurl.com/pjnzz5g

If it is under Apple Care, take it to the Apple Store.
 
Last edited:

fitzroy67

macrumors newbie
Original poster
Apr 7, 2014
3
0
thanks for your quick response. my DIY skills extend to changing mouse batteries so I'll give replacing the sensor a miss. I don't have apple care so I'll try the fan software and see if that helps. thanks again.
 

fitzroy67

macrumors newbie
Original poster
Apr 7, 2014
3
0
installing Macs Fan Control seems to be have done the trick. CPU fan now stays below 1300rpm. Thanks for the advice.