I know this is an older thread, but here's something I've found. If you're replacing a WD drive, you need to rotate the temp sensor connector 180º when connecting it to the new drive, so the dark cable is closest to the drive's PCB.
[code]
1 2 3 4
• • D • |DATA||POWER|
• • L •
5 6 7 8
[/code]
This will fix the issue of the fans spinning up after a few minutes (technically, because the "HDD Proximity" sensor data was out of tolerance).