Original post by: Dan ,
How about downloading this app so you can double check to make sure your fans are not in trouble: [https://www.tunabellysoftware.com/tgpro|TG Pro]. To double check to see if your drive is having problems I would recommend connecting your system to another Mac via either a FireWire or Thunderbolt cable. Then start up your Mac in Target Mode which will allow you to access from the other Mac your systems drive. Using Disk Utility on your friends Mac you should be able to check you drive out. But before you do you may want to copy off anything important just in case the drive is in trouble.