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How much noise should my G4 fan make?

2831 Views 2 Replies Latest reply: Nov 11, 2007 10:28 AM by Graham Lucas RSS
budzilla Calculating status...
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Oct 6, 2007 2:45 PM
I recently purchased a second hand G4 iMac flat-panel (for my kids to use so they'd leave my Intel iMac alone!). In contrast to the Intel iMac, which is virtually silent, the G4 cooling fan makes noticeable noise, which increases in volume over time - the longer the system is running the louder the fan gets, presumably because it's working harder to cool the system. I've installed Temperature Monitor, and note that the internal temperature gets as high as 104 F. Is the fan noise and temperature level normal for this model of iMac? It's not wind-tunnel loud, just noticeable. I've worked on other G4s that didn't really have a noticeable fan noise. Thanks for any help/advice.
17" iMac G4, USB 2.0, Mac OS X (10.3.9), 768 MB
  • AxL Level 6 Level 6 (11,440 points)
    Currently Being Moderated
    Oct 6, 2007 3:11 PM (in response to budzilla)
    I wouldn't worry at this temperature, quite normal IMO.

    Mine is almost four years old now, and noticeably louder than when it was new:
    They get filled with more and more dust over time, that's why cooling is getting more and more difficult.

    You would be surprised how much dust amasses and aggregates inside in some parts. Looks like snow in a micro-landscape of <choose snowy region in the middle of winter> in Canada

    Fans also normally kick up sometimes for half a minute or so, when playing a DVD or a CD?

    Oh and if you plan to clean it without taking it apart (possible but very difficult), better vacuuming than blowing!

    Not much to worry about.
    Axel
    G4 iMac (17-inch 1.25GHz 1GB); C2D iMac (20-inch 2.33GHz 2GB), Other OS; Mac OS X (10.4.10); Mac OS X (10.3.9)
  • Graham Lucas Level 1 Level 1 (45 points)
    Currently Being Moderated
    Nov 11, 2007 10:28 AM (in response to budzilla)
    Hi Budzilla,

    The fan on my G4 iMac has also got louder and louder. I heeded AxL's advice that it was probably caused by a build up of dust and today decided to open it up for a thorough clean.

    It wasn't too difficult, if you're reasonably competent and take things slowly and carefully. I won't post a full explanation here (I'm sure there are plenty of detailed descriptions elsewhere) but briefly, I removed the baseplate, unscrewed the main base from the dome and vacuumed out the logic board area. Then removed the drive to access the fan and gave that a good clean too. There was a lot of dust!

    You'll be pleased to hear that once reassembled, the fan was virtually silent and is now only just audible after an hour or so of activity. In fact, my external firewire is noiser!

    In conclusion, well worth the 30 minutes it took and if you don't fancy the DIY approach, a good repair shop should be able to carry out the same procedure while you wait.

    Hope this helps,

    Graham.
    iMac 24" white, MacBook 2GHz & iMac G4, Mac OS X (10.5)

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