If you replace your drive, your iMac will initially seem fine, but soon the fan will begin to speed up to full speed.
This is due to Apple replacing the external Hard Drive temperature sensor with a proprietary firmware and using the drives internal sensor. Replacement drives do not contain the firmware to deliver temperature data on the temperature sensor cable. When the iMac does not receive a good signal from the hard drive it puts the fan at full speed to protect the drive. Since the late 2009 iMacs came out, replacing the hard drive has caused the internal Hard Drive Fan to start running at around 6000RPM. Hi, likely the new Drive doesn't have the Termal sensor.
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