My macbook air infrequently gets this sound, itís not a fan resonance, it sounds similar to the harddrive rotating; it does it three times stops for a small number of seconds then repeats. I have comprised and endeavor to pinpoint the position and it seems it is on the higher right side beneath the keyboard (similar to eliminate, eject, & sound key corner; additional than might be wrong). This merely occurs infrequently and be able to last anywhere commencing five minutes to a small number of hours. My local "Best Buy" retread told me by means of the intention of it was almost certainly for the reason with the intention of it was cold out (might be logical) and with the intention of I be supposed to not be anxious. So anybody be familiar by means of what my problem is.