Yes you should power down your pc, take the side off, clean the inside of the pc, remove and replace the chip fan,,, and if it is a factory fan always a good idea to remove the heatsink, clean off the thermal paste from the chip and heatsink, add new thermal paste or gel replace heatsink and NEW fan... replace side and fire it up... should take care of it...
Death has a thousand doors, let's see which one our victim chose.
"There's one thing that you learn on this job, is that human beings are capable of anything"
If you chase two rabbits, you lose them both
You say tomato... I say cause of death