iMac G5 20" Model A1076 Identifying Faulty Fan

I have recently repaired a blown capacitor on my old iMac and replaced the hard drive, but since doing so, one of the fans suddenly sounds like a jet! I have ran the Apple Hardware Test and it reported: 2FAN 4/8 system fan. I know there is a left upper fan and a right upper fan and also a small lower intake fan, but which is the test referring to? I've checked all over but cannot find any reference for system fan! Please help!

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Take the back off. Hit the CUDA button reset button ( to the left of the diagnostic lights) and look at the fans. Pick the one that's running wild and check the heat sensor on it. That failing get a copy of SMC Fan Control software.

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