Hope to find some answers here. Just recently I have checked the temperatures due to some fun noise and I happen to see backside fan rpm stucked at 3000 rpm. I haven't seen any abnormal temperatures though on all my sensor readings. What could be the culprit? Can it be fixed thru a simple SMU reset?
SMU would be the first thing to try. Instructions courtesy of iFixit:
1. Turn off the computer by selecting Shut Down from the Apple menu or by holding the power button until the computer turns off.
2. Open and remove both the metallic outer door and the inner plastic air deflector.
3. Remove the fan assembly immediately to the left of the processor module.
4. Press the SMU reset button on the logic board.
5. Replace the fan assembly, air deflector, and outer door.
6. Turn on the computer.