Chances are, your fans are the problem. Something small may have gotten underneath the blades and/or the shaft of the fan blades have "dried-out." Meaning all it needs is to be greased with bearing greased. You will have to remove the fan(s) from the laptop and remove the two screws that attaches the faceplate. Also, that faceplate is very easy to bend and will cause the fan blade to "scrape" the bottom of your case where the fan sits. The fan is repairable because it has NO bearings inside at all. Yes the fan can be taken apart, like anything else that rotates it needs lubrication grease.