Convert PMG5 from Liquid-Cooled to Aircooled

Discussion in 'PowerPC Macs' started by iamMacPerson, Mar 11, 2014.

  1. iamMacPerson macrumors 68030

    iamMacPerson

    Joined:
    Jun 12, 2011
    Location:
    AZ/10.0.1.1
    #1
    So I picked up a Power Mac G5 a few weeks ago. DP 2.7GHz 2005 model, 8GB of RAM, 500GB HDD. I was able to install the OS, but when I tried to run Software Update, it kept freezing. I cracked it open and noticed that there was some corrosion inside. AFAIK, the machine will still boot, but I don't want to fire it up until I fix the issue to avoid further problems.

    I think what is happening is the the processor is overheating and shutting down. I couldn't figure out how to get the cover that says "G5" off so I can't get pass that.

    I was reading that someone successfully converted a 2004 model to Air Cooled, but theirs was a 2.5GHz model. I have the Early-2005 2.7GHz model. Would it be possible to do the same thing or might I run into problems of heat due to the higher clock speed? Also, did they redesign the heat sinks?
     
  2. gavinstubbs09 macrumors 65816

    gavinstubbs09

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    NorCal boonies ~~~by Reno sorta
    #2
    The pin to take off I believe people have drilled them out with those C things that you screw into walls but screw that into the center of the pin in the right hand corner of the G5 label and you should be able to get that out, then slide the metal to the left till it unlatches.
     
  3. jrsx macrumors 65816

    jrsx

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    Location:
    Tacoma, Washington
    #3
    Replacing water-cooled with air-cooled wouldn't be very wise. You would most likely end up with a much hotter system, resulting in more crashes and hard shut downs.
     
  4. gavinstubbs09 macrumors 65816

    gavinstubbs09

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    #4
    Would it be possible to take the much more reliable LCS from a Quad and attach it to the 2.7GHz?
     
  5. OrangeSVTguy macrumors 601

    OrangeSVTguy

    Joined:
    Sep 16, 2007
    Location:
    Northeastern Ohio
    #5
    I ran the heat sinks off air cooled g5s on my quad core. I think I have a thread on it. There are also two types of liquid cooling systems, one had 2 pumps and the other had a one pump system.

    I think I even attempted to use different heatsinks/fans from other CPUs that had more pipes on it for better transfer to the fins.
     
  6. iamMacPerson, Mar 11, 2014
    Last edited: Mar 11, 2014

    iamMacPerson thread starter macrumors 68030

    iamMacPerson

    Joined:
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    AZ/10.0.1.1
    #6
    So, today I've been dissecting the G5 (by dissecting I mean I finally got the damn heat sink cover off) and got a good look at the LCS. It looks like Apple may have replaced it at some point. The beach balling probably was due to the processors overheating, but not due to the LCS leaking, no. Just a bunch of crap in the fans and radiators. It was in a very dusty environment.

    I will need to take a trip to Sears tomorrow to pickup a long handle T10 screw driver to take the whole assembly off. It does show signs of leaking, although they are not that bad. All I see so far is some corrosion on the PSU (that white, kinda rice looking stuff) and some "rice" build up on one of the connections.

    While doing this, I figured I might as well fix the damn thing so does anyone have a good repair guide for a dual 2.7GHz Power Mac G5 LCS? I may try my hand at it. I don't have much to loose (I didn't pay very much for it)

    No matter what, a full teardown of the machine needs to be done. It just bugs me to see a computer this dirty, plus its good practice if I ever do get a G5. Maybe this coming weekend (hey my birthdays this weekend!) I'll tear it apart. I'll also check the LoBo while in there for damage. I don't think the liquid went far, though.

    Also, does anyone have a good tear down guide?

    Here are some pictures:

    IMG_0086.JPG

    IMG_0087.JPG

    IMG_0088.JPG
     
  7. iamMacPerson thread starter macrumors 68030

    iamMacPerson

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    AZ/10.0.1.1
    #8
    Thanks!

    With that in mind, I'm back on the fence about it. It seems I would have to do a full service to the LCS every 2 years. I'm not sure if its worth it. Should I fix this one or keep an eye out for an Air Cooled model? (Probably the last Late-2005 2.0/2.3GHz Model)

    No, you know what? I'll do both. Fix it, keep it, and get a high end Air Cooled model. Now to find a place for this one and the soon-to-be one.
     
  8. OrangeSVTguy macrumors 601

    OrangeSVTguy

    Joined:
    Sep 16, 2007
    Location:
    Northeastern Ohio
    #9
    The heat sinks off the single CPU dual core models won't swap into the quad. Those heat sinks are a little bit bigger so the second heatsink won't fit. You'll have to get heat sinks from the single core model.
     
  9. iamMacPerson thread starter macrumors 68030

    iamMacPerson

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    #10
    Oh no, its not for swapping parts. I'm keeping both machines. The LCS G5 will be a weekend project of sorts and the Air Cooled model will probably sit next to my Mac Pro as my fast and reliable PPC machine.

    Does anyone know of a good Cooler Fluid for the G5? Preferably from Amazon?
     
  10. OrangeSVTguy macrumors 601

    OrangeSVTguy

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    Location:
    Northeastern Ohio
    #11
    I used Feser One. Non corrosive and non conductive of electricity so if by some chance it does fail, it won't hurt any of the components. I also used clear tygon tubing and just reused the old clamps on an older g5 computer.
     
  11. iamMacPerson thread starter macrumors 68030

    iamMacPerson

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    #12
    Your G5, did it had the metal tubing like mine? If so, why did you replace them with new tubing?
     
  12. OrangeSVTguy macrumors 601

    OrangeSVTguy

    Joined:
    Sep 16, 2007
    Location:
    Northeastern Ohio
    #13
    It was the rubber hosing I believe. My other ones have the metal tubing. I replaced it with clear so I could see if it was full when I filled it. Also it was cool looking lol.
     
  13. concun64 macrumors newbie

    Joined:
    Dec 12, 2013
    Location:
    Galveston, Texas
    #14
    Service Manuals for all Apple products

    Try this site for service manuals for all Apple products.
    http://manuals-apple.9manuals.com[/URL]
     
  14. reddrag0n macrumors 6502

    reddrag0n

    Joined:
    Oct 1, 2007
    Location:
    Canada
    #15
    For anyone that wants to know, i upgraded a DP 2.5 to air cooling. All i did was swap the heatsinks that are the copper base with heatpipe design. Took off the LCS that was defective and put the heatsinks on. Kept the small single pipe heat exchanger as default and that was it. Ran the ASD 2.5.8 cd and everything ran fine. There was no real difference in heat as Apple said there would be. My idle temps were around 35 - 40 degrees celcius, and peak was at around 60 - 65. Sure the fans would ramp when i would do anything task hungry but then it would quiet back down.

    P.S. more information on what i did on iFixit
     
  15. AmestrisXServe macrumors 6502

    Joined:
    Feb 6, 2014
    #16
    Agreed: Air-cooling it would be a disaster. You can repair the liquid-cooling system in a variety of ways. For a small leak, some epoxy putty, used to patch a radiator, can work.

    Apple should have made the piping out of titanium.
     

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